[Enhancement] Notify reviewer added in pull request via codeowners file

[mg-cloud]

Feature Description

This could be an enhancement of #24910
This pull request added the neat codeowners feature to automatically add reviewer to pull request upon creation.
However, the reviewer are not notified by email unlike when added manually after the pull request is created.

I didn't find any discussion around that in the parent issue so i dunno if this was done on purpose or if this could be a nice enhancement of this feature.

Screenshots

No response

[lunny]

This should be considered as a bug but not a proposal.