[API] Fix projects leader to sync enrichment to followers

[Hedingber]

Recently we started seeing these tests almost constantly fail in CI:

>               assert (
                    follower._projects[project.metadata.name].status.state
                    == project.spec.desired_state
                )
E               AssertionError: assert None == <ProjectDesiredState.online: 'online'>
E                 +None
E                 -<ProjectDesiredState.online: 'online'>

tests/api/utils/projects/test_leader_member.py:595: AssertionError
FAILED tests/api/utils/projects/test_leader_member.py::test_projects_sync_follower_project_adoption
FAILED tests/api/utils/projects/test_leader_member.py::test_projects_sync_leader_project_syncing
FAILED tests/api/utils/projects/test_leader_member.py::test_projects_sync_multiple_follower_project_adoption

In the investigation we saw that it only reproduces with the dockerized tests and it also reproduces with very old code leading to the conclusions that the cause for this bug is not in our code but some package that was updated (when testing in docker it rebuild the image and pull latest packages vs local which you usually have slightly older versions)
After some searching I found that Pydantic 1.9.0 -> 1.9.1 caused it, and after going over the changes this PR was the suspect - pydantic/pydantic#3642
I've changed the nop follower we're using in those tests to always use .copy(deep=True) of what it is getting and saw that indeed the test now fails even with 1.9.0
This revealed and actual bug in our code, when the leader finds a project in the follower, it enriches it (as of now enrichment is just assigning the desired state to the status state) but then it doesn't update the project in that follower which is why the tests fail, so beside of changing the nop-follower to use deep copy, I fixed the leader to do this update

[Tankilevitch]

Amazing you found the reason for that annoying CI bug!! minor comment.

[Tankilevitch]

The function became really long, and it seems like there are two main scenarios which can be split up to two functions and make the function flow much clearer to follow:

1. when project doesn't exists in leader
2. when project doesn't exists in follower