[TASK] Add test for EXT:solr integration

[dkd-friedrich]

Add pipeline with EXT:solr integration tests or trigger the EXT:solr special workflow/ pull request using provided solr-typo3-plugin artifact.

Relates: #26

[dkd-friedrich]

This task may require adaptions to the tests in EXT:solr, alternatively simple select queries with activated access plugin may be used.