[Feature Request]: Include module readme updates to pipeline trigger paths

### Description

Due to the recently added test which verifies module readmes are compliant with the Set-ModuleReadme script, changes to the readme files should trigger the corresponding module pipelines.
In fact, changes to readme files could invalidate the test, causing the static validation step and thus the pipeline to fail.

- Update pipeline trigger paths to include module readme.
- .md files other than the module readmes should still be excluded.