Backport #30313 by wxiaoguang
`log.Xxx("%v")` is not ideal, this PR adds necessary context messages.
Remove some unnecessary logs.
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Fix#26723
Add `ChangeDefaultBranch` to the `notifier` interface and implement it
in `indexerNotifier`. So when changing the default branch,
`indexerNotifier` sends a message to the `indexer queue` to update the
index.
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Co-authored-by: techknowlogick <matti@mdranta.net>