Add flag snippet_count_check to GitAccessSnippet

What does this MR do?

In staging and production we're having an error that is not raised in local. With this flag, we plan to disable the check Checks::PushFileCountCheck because it appears in the errors logs and we have to discard things.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry ~~
• [-] Documentation (if required)~~
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content