Migrating OAuthStore to sqlx (#18302)

* Migrating OAuthStore to sqlx

https://community-daily.mattermost.com/boards/workspace/zyoahc9uapdn3xdptac6jb69ic/285b80a3-257d-41f6-8cf4-ed80ca9d92e5/495cdb4d-c13a-4992-8eb9-80cfee2819a4?c=71efa7c4-53be-4732-87cc-d53726d2cd53

```release-note
NONE
```

* Fixing some broken tests

```release-note
NONE
```

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/sqlstore/utils.go

@@ -55,6 +55,14 @@ func finalizeTransaction(transaction *gorp.Transaction) {
 	}
 }
 
+// finalizeTransactionX ensures a transaction is closed after use, rolling back if not already committed.
+func finalizeTransactionX(transaction *sqlxTxWrapper) {
+	// Rollback returns sql.ErrTxDone if the transaction was already closed.
+	if err := transaction.Rollback(); err != nil && err != sql.ErrTxDone {
+		mlog.Error("Failed to rollback transaction", mlog.Err(err))
+	}
+}
+
 // removeNonAlphaNumericUnquotedTerms removes all unquoted words that only contain
 // non-alphanumeric chars from given line
 func removeNonAlphaNumericUnquotedTerms(line, separator string) string {