Add default paths to ignore for various languages in build matrix

[felickz]

When applying a paths filter (as is done by this action), the paths-ignore defaults from the CodeQL extractors are NOT utilized. This will likely lead to unwanted detections and decreased performance. This PR aims to pull in some opinionated defaults to continue the journey for improved monorepo scanning.

Primary motivation for this PR was discovered during a performance evaluation

• Finding that Ignored the default CodeQL behavior and is extracting .min.js files:

 [2025-04-11 14:37:52] [build-stdout] Done extracting /home/runner/work/sample-javascript-monorepo/sample-javascript-monorepo/packages/babel-cli/src/babel/sample.min.js (3 ms)

Changes to build-matrix.js (used by the changes and whole-repo action):

• Enhancements to default path ignore patterns:
  • changes/build-matrix.js: Added default path ignore patterns for JavaScript/TypeScript, Java/Kotlin, Python, C#, Ruby, and C/C++ to improve the handling of unnecessary files during scans.
• Application of default path ignore patterns:
  • changes/build-matrix.js: Implemented logic to apply default path ignore patterns if not explicitly provided in the project configuration. A warning is issued for languages with build-mode: none if no path ignore patterns are set.

Documentation update:

• README.md: Updated the documentation to reflect the use of default path ignore patterns if not passed in the config input.