test: cover sqlite statements after database close

[umuoy1]

This PR adds coverage for DatabaseSync closing behavior with existing prepared statements.

The tests verify that after close() or [Symbol.dispose]():

• database methods such as prepare() and exec() report that the database is not open
• existing StatementSync instances report that the statement has been finalized
• reopening the database does not make old statements usable again

[nodejs-github-bot]

Review requested:

• @nodejs/sqlite

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (131fd84) to head (ad0690e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62978      +/-   ##
==========================================
- Coverage   91.94%   90.05%   -1.89%     
==========================================
  Files         362      714     +352     
  Lines      155999   225242   +69243     
  Branches    24057    42582   +18525     
==========================================
+ Hits       143429   202849   +59420     
- Misses      12295    14187    +1892     
- Partials      275     8206    +7931     

see 477 files with indirect coverage changes

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[umuoy1]

Hi, just wanted to check if someone from @nodejs/sqlite could take a look at this when they have time.

This is a test-only PR for node:sqlite, adding coverage for StatementSync and iterators after DatabaseSync.close() / Symbol.dispose. If this looks reasonable, could someone also help start CI?

Thanks!

[louwers]

I think there's already two other PRs that implement this as well.