Bug fix: SearchFilesByName errors when starting with a dash for basic search

Context

We are seeing errors for the repository search when the name searched for starts with a dash.

Related to #386435 (closed) but for basic search, not advanced search.

• Location: SearchFilesByName in Gitlab::GitalyClient::RepositoryService
• Level: project
• Scope: blobs
• Type: basic
• Web & API
• Error: cannot start with dash '-'

Impact

227 errors in 7 days.

Possible fix

Add dash (-) to symbols that get substituted before making the query: https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/git/repository.rb#L1064