Add SQL error tests and fix plausibleGender concept handling

[maheshchilukamari]

Closes #605

Summary

Adds test coverage to verify that TABLE, FIELD, and CONCEPT checks
executed against Eunomia do not return SQL errors.

The new CONCEPT assertion exposed an existing SQLite syntax error in the
plausibleGender check when multiple concept IDs were supplied.

Changes

• Added assertions checking results$CheckResults$error for TABLE,
  FIELD, and CONCEPT Eunomia tests
• Updated the plausibleGender SQL predicates from = @conceptId
  to IN (@conceptId) to support multiple concept IDs

Testing

• Ran testthat::test_file("tests/testthat/test-executeDqChecks.R")
  • FAIL 0 | WARN 0 | SKIP 2 | PASS 37

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.13%. Comparing base (490758b) to head (fea8f44).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #679      +/-   ##
===========================================
- Coverage    87.15%   86.13%   -1.02%     
===========================================
  Files           17       17              
  Lines         1082     1082              
===========================================
- Hits           943      932      -11     
- Misses         139      150      +11     

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