Add eslint support for semver validation and optional description to @since tag

[USERSATOSHI]

What?

Closes #20859

This PR adds supports for adding semver validation and optional description for @since tag in JSDoc

Why?

While #20427 ( increasing severity of eslint-plugin-jsdoc ) was being worked on, It was found that, It flagged description/explanation after the version in @since which is a frequently-used pattern in WordPress projects.

Due to this, jsdoc/check-values was disabled to prevent errors but this leads to manually checking versions in @since.

This PR adds supports for semver validation on @since while also adding support for optional description.

How?

This PR adds a custom @wordpress/require-valid-since ( name can be changed ) which checks for proper semver versions in @since tag while also allowing optional description.

Testing Instructions

Added Unit Tests should suffice for testing

Screenshots or screencast

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