QL tests: run with --check-diff-informed

[cklin]

No description provided.

[d10c]

Note: another language that (currently) only has tests in github/codeql is Go:

codeql/go/Makefile

Lines 57 to 58 in a46f8fb

	codeql test run -j0 ql/test --search-path .. --consistency-queries ql/test/consistency --compilation-cache=$(cache) --dynamic-join-order-mode=$(rtjo)
	# use GOOS=linux because GOOS=darwin GOARCH=386 is no longer supported

https://github.com/github/codeql/blob/a46f8fb0d9533114f3c634d7ec1e09f4c8b1c505/go/actions/test/action.yml#L81-L82

codeql/.github/workflows/go-tests.yml

Lines 38 to 39 in a46f8fb

	uses: ./go/actions/test
	with:

[Copilot]

Pull Request Overview

This PR updates various CodeQL test commands to include the new --check-diff-informed flag, ensuring tests also evaluate diff-related checks.

• Updated test target in ruby/Makefile
• Modified CodeQL test commands in go/Makefile
• Added the flag to CodeQL test runs in multiple GitHub workflow files (.github/workflows/ruby-qltest.yml, ruby-qltest-rtjo.yml, and csharp-qltest.yml)

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ruby/Makefile	Added --check-diff-informed flag in the test target command.
go/Makefile	Inserted --check-diff-informed flag into test commands.
.github/workflows/ruby-qltest.yml	Updated test run command with the new flag.
.github/workflows/ruby-qltest-rtjo.yml	Updated test run command with the new flag.
.github/workflows/csharp-qltest.yml	Updated test run command with the new flag.

[cklin]

@d10c Thank you for your comment about Go! I totally missed that.

I added you as reviewer for this PR.

Since all that this PR does is to standardize QL testing across languages, and you have experience in this area, I think your approval would be sufficient to merge this change.

Please let me know if you have any further feedback!

[d10c]

I think this covers all the github/codeql language tests, so LGTM.