CSHARP-6161: Enable the code-style rules that need little or no reformatting

[papafe]

https://jira.mongodb.org/browse/CSHARP-6161

[Copilot]

Pull request overview

This PR updates repository code-style configuration and applies low-impact formatting changes across the driver and test code to comply with newly-enabled analyzers (primarily modifier ordering and related style rules).

Changes:

• Tightens/adjusts .editorconfig style severities (notably csharp_preferred_modifier_order to warning) and enables a naming rule for interface I-prefixing.
• Applies widespread modifier-order fixes (static readonly, public new, etc.) across src/ and tests/.
• Includes a behavioral change in CombinedProjectionDefinition<TSource> flattening logic (adds non-combined projections into the combined list), which should be confirmed as intended for a “style-only” PR.

Reviewed changes

Copilot reviewed 38 out of 38 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/MongoDB.TestHelpers/XunitExtensions/TimeoutEnforcing/SkippableTestMessageBus.cs	Reorders static readonly field modifiers to match preferred modifier order.
tests/MongoDB.Driver.Tests/Specifications/connection-monitoring-and-pooling/ConnectionMonitoringAndPoolingTestRunner.cs	Reorders static readonly schema constants (and array) modifiers for style compliance.
tests/MongoDB.Driver.Tests/Linq/Linq3Implementation/Translators/ExpressionToPipelineTranslators/JoinAfterSelectManyToPipelineTests.cs	Reorders static test fixture fields’ modifiers to preferred order.
tests/MongoDB.Driver.Tests/Core/Clusters/MultiServerClusterHeartbeatConcurrencyTests.cs	Reorders static test fields’ modifiers to preferred order.
tests/MongoDB.Driver.Tests/Core/Clusters/MultiServerClusterHandshakeNetworkErrorTests.cs	Reorders static test fields’ modifiers to preferred order.
tests/MongoDB.Bson.Tests/Serialization/Serializers/MemorySerializerTests.cs	Reorders TestData member modifiers to preferred order.
tests/MongoDB.Bson.Tests/Serialization/Serializers/BinaryVectorSerializerTests.cs	Reorders TestData members’ modifiers to preferred order.
src/MongoDB.Driver/ProjectionDefinitionBuilder.cs	Fixes modifier/style and updates combined-projection flattening logic (functional change).
src/MongoDB.Driver/Linq/Linq3Implementation/Translators/ExpressionToFilterTranslators/MethodTranslators/InjectMethodToFilterTranslator.cs	Reorders static readonly field modifiers to preferred order.
src/MongoDB.Driver/Linq/Linq3Implementation/Misc/ConvertHelper.cs	Reorders static readonly field modifiers to preferred order.
src/MongoDB.Driver/Linq/Linq3Implementation/Ast/AstSortField.cs	Reorders static readonly cached instances’ modifiers to preferred order.
src/MongoDB.Driver/GridFS/GridFSFileInfoCompat.cs	Reorders public new property modifiers to preferred order.
src/MongoDB.Driver/GridFS/GridFSFileInfo.cs	Reorders public new property modifiers to preferred order.
src/MongoDB.Driver/DensifyRange.cs	Reorders static readonly cached instances’ modifiers to preferred order.
src/MongoDB.Driver/Core/Logging/StructuredLogTemplateProviders.cs	Reorders static readonly field modifiers to preferred order.
src/MongoDB.Driver/Core/Clusters/ServerSelectors/WritableServerSelector.cs	Reorders singleton instance field modifiers to preferred order.
src/MongoDB.Driver/Core/ChangeStreamDocument.cs	Reorders public new property modifiers to preferred order.
src/MongoDB.Driver/ChangeStreamPreAndPostImagesOptions.cs	Reorders public new property modifiers to preferred order.
src/MongoDB.Driver/AsyncCursorHelper.cs	Reorders static async method modifiers to preferred order.
src/MongoDB.Bson/Serialization/Serializers/ObjectSerializer.cs	Reorders static readonly fields in allowed-types implementation to preferred order.
src/MongoDB.Bson/Serialization/Serializers/NullableSerializer.cs	Reorders cached serializer instance fields’ modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonTimestamp.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonSymbol.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonString.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonRegularExpression.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonObjectId.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonJavaScriptWithScope.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonJavaScript.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonInt64.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonInt32.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonDouble.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonDocument.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonDecimal128.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonDateTime.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonBoolean.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonBinaryData.cs	Reorders public static new factory method modifiers to preferred order.
src/MongoDB.Bson/ObjectModel/BsonArray.cs	Reorders public static new factory method modifiers to preferred order.
.editorconfig	Enables/adjusts analyzer rules and severities (modifier order warning, braces preference, using statement preference, interface naming suggestion).

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