IDEA-CR-51235: vcs-ignore: add registry flag to disable ignored to exclude synchronization (IDEA-219152)

Processing file events may affects overall performance and may lead to EDT freezes. Introduce registry flag which disable event processing in IgnoredToExcludedSynchronizer component.

(cherry picked from commit 23191b33bc202648ebcf7a8ccf1a496f752cc0ef)

GitOrigin-RevId: 8898a49774401e09a510facaac612d92e3b86243