The Gitea codebase was logging `Elasticsearch` and `Meilisearch`
connection strings directly to log files without sanitizing them. Since
connection strings often contain credentials in the format
`protocol://username:password@host:port`, this resulted in passwords
being exposed in plain text in log output.
Fix:
- wrapped all instances of setting.Indexer.RepoConnStr and
setting.Indexer.IssueConnStr with the `util.SanitizeCredentialURLs()`
function before logging them.
Fixes: #35530
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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