Fix unecessary generation of verification metas #3228

Job	Run time
setup / Get and cache Dart dependencies	30s
setup / Compile sqlite3 for tests (ubuntu-latest)	5s
setup / Compile sqlite3 for tests (macos-latest)	10s
setup / Compile sqlite3 for tests (windows-latest)	12s
sqlparser	38s
Documentation	4m 24s
drift package	2m 6s
drift_dev	7m 50s
Integration tests for migration tooling	1m 6s
Integration tests	2m 55s
test_flutter (3.27)	2m 2s
test_flutter (3.29)	2m 1s
Web integration tests	4m 42s
drift_web_ddc	3m 38s
Drift web unit tests, dart2wasm, chrome	3m 57s
	36m 16s

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