ref(git hooks): Only suggest autoupdate variable when pulling if not already set #45179
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This PR refactors the post-merge git hook so that it not longer suggests setting
SENTRY_POST_MERGE_AUTO_UPDATEif it's already set. Instead, it prints a message confirming that it's running the auto-update because it's detected the variable.It also:
if [[ "$needs_update" ]]block