feat(cmd): add 'get' subcommand for build and buildrun resources

[mohit-bhandari45]

Changes

Introduced the missing get subcommand for both build and buildrun resource managers (shp build get and shp buildrun get):

• shp build get <name>: Retrieves detailed specification and status for a Build object (Source URL, revision, strategy, output image, registration status).
• shp buildrun get <name>: Retrieves detailed specification and status for a BuildRun execution object (Build ref, status condition, start & completion times).
• Output Formats: Added support for -o json and -o yaml flags, as well as a default clean key-value summary table.
• Error Handling: Handled NotFound errors gracefully with friendly messages (e.g. Build 'xyz' not found in namespace 'default'.).
• Unit Tests: Created comprehensive unit test suites in pkg/shp/cmd/build/get_test.go and pkg/shp/cmd/buildrun/get_test.go (100% passing).

Note: As discussed, the missing update subcommand will be submitted in a separate follow-up PR.

Related Issue

Fixes #411

Type of PR

/kind feature

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Kind label has been set
• Release notes block has been filled in, or marked NONE

Release Notes

Added `shp build get <name>` and `shp buildrun get <name>` subcommands to inspect Build and BuildRun resources with support for `-o json` and `-o yaml` output formatting.

[openshift-ci]

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[mohit-bhandari45]

@kaizakin Please review this pr.

[mohit-bhandari45]

@SaschaSchwarze0 Do review this once you get time.

[kaizakin]

please address my comments

and btw try to reduce duplicated code if possible/applicable

[mohit-bhandari45]

@kaizakin all your comments are resolved.