Apply 2.x specific tests to CouchDB 3.x

[jjrodrig]

Checklist

• [X] Tick to sign-off your agreement to the Developer Certificate of Origin (DCO) 1.1
• [X] Added tests for code changes or test/build only changes
• [ ] Updated the change log file (CHANGES.md|CHANGELOG.md) or test/build only changes
• [X] Completed the PR template below:

Description

During testing on new CouchDB 3.x, I've noticed that some tests are skipped. These tests only run in a CouchDB 2.x.

This PR extends the version checking to 3.x for those tests.

Approach

Schema & API Changes

No change

Security and Privacy

No change

Testing

The following tests should pass in Couchdb 2.x and 3.x

changes_dbChangesMustSuccessfullyReturnWithSeqInterval changes_selector changes_selectorAndMoreThanLimitNumberOfDocs pull_filterDocIdsFromAnimalDb_twoDocShouldBePulled pull_filterSelectorMammalFromAnimalDbUsingParameterizedFilter_eightDocShouldBePulled pull_filterSelectorBirdFromAnimalDb_twoDocShouldBePulled pull_filterSelectorMammalFromAnimalDbUsingParameterizedFilter_eightDocShouldBePulled pull_filterSelectorSmallFromAnimalDbUsingIntegerFilter_eightDocShouldBePulled pull_filterSelectorSmallFromAnimalDbUsingNullFilter_eightDocShouldBePulled

Monitoring and Logging

No change

[bessbd]

I'm about to merge this.