Add vale linting in github pipeline

[Hermione2408]

What has changed?

Vale has been integrated for grammar and style checking, which will further improve the consistency and quality of the documentation. Ensuring the docs are free from errors will help Vale operate more effectively, making future updates smoother and maintaining high documentation standards.

Closes - keploy/keploy#2363

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Documentation update (if none of the other choices apply).

How Has This Been Tested?

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.

[Sonichigo]

LGTM