test: align runner tests with provider modules

[edersonbrilhante]

Description

Align test-file ownership with the runner-provider module layout introduced in #5203 and requested in #5230.

This PR only renames or relocates existing tests. Provider-neutral tests remain beside the shared orchestration modules, while EC2-specific tests move beside their EC2 implementations.

I plan to create following PR to reduced some duplicated tests. I didn't change in this PR to prevent a hard review

Test cases moved or renamed

• Renamed control-plane/src/aws/runners.test.ts to ec2-runners.test.ts.
• Renamed webhook/src/runners/dynamic-labels-policy.test.ts to ec2-dynamic-labels-policy.test.ts.
• Moved 19 existing canRunJob test declarations from dispatch.test.ts to labels.test.ts.
• Moved four existing AWS dynamic-label test declarations from dispatch.test.ts to aws-dynamic-labels.test.ts.
• Moved three existing EC2 dynamic-label test declarations from dispatch.test.ts to ec2-dynamic-labels.test.ts; 18 dispatch integration tests remain in dispatch.test.ts.
• Moved four existing EC2 pool-size test declarations from pool.test.ts to ec2-pool.test.ts; 17 provider-neutral pool tests remain in pool.test.ts.
• Moved 20 existing EC2 scale-down test declarations from scale-down.test.ts to ec2-scale-down.test.ts; four provider-neutral eviction-order tests remain in scale-down.test.ts.
• Moved 251 existing EC2 scale-up test declarations from scale-up.test.ts to ec2-scale-up.test.ts; the provider-selection test remains in scale-up.test.ts.

Test cases created

None.

Duplicated test cases merged

None.

Test cases deleted

None. The test titles and coverage from origin/main are preserved.

Test Plan

• Renamed EC2 suites: 85 tests passed.
• Webhook runner suites: 44 tests passed.
• Pool suites: 21 tests passed.
• Scale-down suites: 130 tests passed.
• Scale-up suites: 254 tests passed.
• ESLint passed for every affected test file.
• git diff --check passed.
• Repository pre-commit hooks passed for all five commits.

Related Issues

Closes #5230

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None