chore: use test helpers across db tests

instead of copied and pasted versions

.clj-kondo/config.edn

@@ -173,6 +173,7 @@
              logseq.db.frontend.validate db-validate
              logseq.db.sqlite.cli sqlite-cli
              logseq.db.sqlite.util sqlite-util
+             logseq.db.test.helper db-test
              logseq.graph-parser graph-parser
              logseq.graph-parser.text text
              logseq.graph-parser.db gp-db