Actions: Improve bash support

[JarLob]

Pull Request checklist

All query authors

• A change note is added if necessary. See the documentation in this repository.
• All new queries have appropriate .qhelp. See the documentation in this repository.
• QL tests are added if necessary. See Testing custom queries in the GitHub documentation.
• New and changed queries have correct query metadata. See the documentation in this repository.

Internal query authors only

• Autofixes generated based on these changes are valid, only needed if this PR makes significant changes to .ql, .qll, or .qhelp files. See the documentation (internal access required).
• Changes are validated at scale (internal access required).
• Adding a new query? Consider also adding the query to autofix.

Copilot reviewed 3 out of 6 changed files in this pull request and generated no comments.

Files not reviewed (3)

• actions/ql/lib/codeql/actions/Bash.qll: Language not supported
• actions/ql/test/query-tests/Security/CWE-094/CodeInjectionCritical.expected: Language not supported
• actions/ql/test/query-tests/Security/CWE-094/CodeInjectionMedium.expected: Language not supported

Comments suppressed due to low confidence (1)

actions/ql/test/query-tests/Security/CWE-094/.github/workflows/test19.yml:112

• [nitpick] The step ID 'title2' is not descriptive. Consider renaming it to something more meaningful, such as 'fetch_pr_title'.

- id: title2

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