add --base-dir flag to flow test for custom search directory

[holyfuchs]

The flow test command previously hard-coded "." as the root when auto-discovering *_test.cdc files. This adds a --base-dir flag so callers can point at a subdirectory, useful when submodules are part of the repository. When explicit file args are passed the flag is ignored, preserving existing behaviour.

Note: using a wildcard pattern like ./cadence/tests/*_test.cdc as explicit args does not recurse into subdirectories, silently missing test files nested further down. --base-dir cadence/tests avoids this by walking the full directory tree.

[github-actions]

Dependency Review

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

Scanned Files

None

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/test/test.go	0.00%	4 Missing ⚠️

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