Add more strongly typed wrapper around test.macro

[mbg]

When defining a test macro using test.macro, the argument types are not strongly enforced when the macro is used with test, test.serial, etc.

This PR adds a makeMacro helper which returns a wrapper around a macro that enforces the argument types.

Replaces #3873.

Risk assessment

For internal use only. Please select the risk level of this change:

• Low risk: Changes are fully under feature flags, or have been fully tested and validated in pre-production environments and are highly observable, or are documentation or test only.

Which use cases does this change impact?

Environments:

• Testing/None - This change does not impact any CodeQL workflows in production.

How did/will you validate this change?

• Unit tests - I am depending on unit test coverage (i.e. tests in .test.ts files).

If something goes wrong after this change is released, what are the mitigation and rollback strategies?

• Development/testing only - This change cannot cause any failures in production.

How will you know if something goes wrong after this change is released?

• Other - Please provide details.

Are there any special considerations for merging or releasing this change?

• No special considerations - This change can be merged at any time.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Consider adding a changelog entry for this change.
• Confirm the readme and docs have been updated if necessary.

[Copilot]

Pull request overview

This PR introduces a makeMacro helper in src/testing-utils.ts to wrap AVA test.macro in a way that preserves stronger argument typing at call sites, and then migrates several existing test macros to use the new wrapper-style invocation.

Changes:

• Add makeMacro helper that creates a typed wrapper around an AVA macro and exposes convenience helpers like .serial() / .test().
• Refactor multiple test suites to declare macros via makeMacro and invoke them via the wrapper APIs (instead of passing macros into test() / test.serial()).
• Update the workspace VS Code snippet to generate makeMacro-based macros.

Show a summary per file

File	Description
src/testing-utils.ts	Adds makeMacro helper and adjusts setupTests parameter naming.
src/upload-sarif.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/status-report.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/start-proxy.test.ts	Migrates several macros/tests to wrapper-style invocation (.serial() / direct call).
src/setup-codeql.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/overlay/caching.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/init.test.ts	Migrates a macro + tests to wrapper-style invocation (direct call).
src/init-action-post-helper.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/diff-informed-analysis-utils.test.ts	Migrates a macro + serial tests to makeMacro wrapper usage.
src/config/db-config.test.ts	Migrates multiple macros/tests and updates internal macro composition to use .fn.
src/config-utils.test.ts	Migrates a macro + many serial tests to makeMacro wrapper usage.
src/codeql.test.ts	Migrates a macro + many serial tests to makeMacro wrapper usage.
.vscode/tests.code-snippets	Updates the “Test Macro” snippet to use makeMacro.

Copilot's findings

• Files reviewed: 13/13 changed files
• Comments generated: 1

[henrymercer]

Very nice!