Added some tests in CI on pull requests

[DmitriyStoyanov]

Added tests into CI,
as we can see that there are many warnings related to issues with existing documentation. Because of that job failed with many warnings here: https://github.com/DmitriyStoyanov/projectalita.github.io/actions/runs/15664625451/job/44127096488
like that:

WARNING -  Doc file 'platform-documentation/menus/prompts.md' contains a link '../prompts/prompts-examples.md', but the target 'platform-documentation/prompts/prompts-examples.md' is not found among documentation files.
WARNING -  Doc file 'platform-documentation/menus/prompts.md' contains a link '../../manuals/alita-dial.md', but the target 'manuals/alita-dial.md' is not found among documentation files.
WARNING -  Doc file 'platform-documentation/menus/settings.md' contains a link '../user-guide/extensions/alita-code.md', but the target 'platform-documentation/user-guide/extensions/alita-code.md' is not found among documentation files.
WARNING -  Doc file 'release-notes/archived/rn1.md' contains a link '../user-guide/intro.md', but the target 'release-notes/user-guide/intro.md' is not found among documentation files.
WARNING -  Doc file 'release-notes/archived/rn2.md' contains a link '../user-guide/intro.md', but the target 'release-notes/user-guide/intro.md' is not found among documentation files.