Link Checker test enhancement

[elad-c]

Pull Request Description:

1. Set link-checker to run in nightly.
2. Set link-checker to run after a PR is merged to main.
3. If a link doesn't exist, try to check is it exists in the PR's branch.

Checklist before requesting a review:

• I set the appropriate labels on the pull request.
• I have added/updated the release note draft (if necessary).
• I have updated the documentation to reflect my changes (if necessary).
• All function and files are well documented.
• All function and classes have type hints.
• There is a licenses in all file.
• The function and variable names are informative.
• I have checked for code duplications.
• I have added new unittest (if necessary).