fix: Combine branch and commit refresh into a single thread

[gadfly3173]

To prevent potential race conditions where commit navigation fails due to stale branch information, this change unifies the branch refresh and commit refresh operations into a single thread.

Previously, separate refresh operations could lead to situations where:

1. Commit refresh completes before branch refresh finishes
2. Navigation then uses outdated branch information
3. This results in incorrect commit jumps

The unified thread ensures branch information is always up-to-date when commits are refreshed, maintaining consistency between these related operations.

[goran-w]

Good catch! Please check also all the occurrences of Task.Run(RefreshCommits) in class Repository...

Could the same issue occur for RefreshCommits vs RefreshTags? (If so, there's yet another case in class Watcher.)

[gadfly3173]

Could the same issue occur for RefreshCommits vs RefreshTags? (If so, there's yet another case in class Watcher.)

Currently, only merge/pull/fetch operations need to navigate to the head commit of the branch after refreshing the commit. Therefore, it is necessary to update the branch information first only when refreshing the branch and triggering the refresh through the watcher.

[goran-w]

Currently, only merge/pull/fetch operations need to navigate to the head commit of the branch after refreshing the commit.

I see - so there's no need to also patch Repository.RefreshAll() and Repository.MarkBranchesDirtyManually() where branches and commits are refreshed in parallel?

BTW, hopefully this will fix an issue I've noticed a few times, where a branch-badge is still shown at an older commit after an operation that should move it, and there even being two instances of the same branch-badge in the log-graph (one at the incorrect older commit and one at the correct newer one)!

[love-linger]

I do not like this change. I've pushed a new commit c112549 that query the changed branch head when we want to navigate it delayed (after commits have been refreshed)