Integration Test for Commit Search containing Square Brackets (#28751)

Integration test for #28744 

Change keywords commit search flag from `-F` to `--fixed-strings` for
readability

modules/git/repo_commit.go

@@ -143,7 +143,7 @@ func (repo *Repository) searchCommits(id ObjectID, opts SearchCommitsOptions) ([
 	}
 
 	// interpret search string keywords as string instead of regex
-	cmd.AddArguments("-F")
+	cmd.AddArguments("--fixed-strings")
 
 	// add remaining keywords from search string
 	// note this is done only for command created above