Add return value to QueryBuilder::executeResetSequence()

[WarLikeLaux]

Q	A
Is bugfix?	❌
New feature?	✅
Breaks BC?	✅
Fixed issues	#20056

What does this PR do?

QueryBuilder::executeResetSequence() and its Oracle override don't return the result of execute(), so Command::executeResetSequence() always returns null. This PR adds the missing return so callers get the affected row count (int).

Continues #20056 (approved by bizley, samdark, Arhell but never merged). This PR extends the fix to oci\QueryBuilder, adds @return PHPDoc to all 3 methods, and adds a test.

Changes

• Add missing return in QueryBuilder::executeResetSequence() and oci\QueryBuilder::executeResetSequence()
• Add @return int PHPDoc to all 3 methods (QueryBuilder, oci\QueryBuilder, Command)

Tests

CommandTest (1 test, 2 assertions): return type check for executeResetSequence() with auto and explicit value.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.13%. Comparing base (37b6e7b) to head (0bcc6f1).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #20765   +/-   ##
=========================================
  Coverage     80.13%   80.13%           
  Complexity    11533    11533           
=========================================
  Files           374      374           
  Lines         30206    30206           
=========================================
  Hits          24207    24207           
  Misses         5999     5999           

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