[git] Add a test for pushing tags
[git] cleanup: use singletonList instead of asList
[git] diagnostics for EA-63031 (no branch result)
[log] Protect against ref comparator errors like in IDEA-133194
NullableNotNullManager: classes can't be nullable
ensure no stale vfs inside temp dirs, that could be left from previous test runs if temp dir names are the same again
[git] IDEA-133876 pull dialog: filter branches by selected remote
[git] remote unused method