Unable to delete outdated records from the pipelines

requested review from @mortim07, @larowlan, and @nterbogt

assigned to @jibran

added 1 commit

7f111981 - Added some tests.

Compare with previous version

added 23 commits

7f111981...b1ec4a76 - 5 commits from branch project:1.x
b1ec4a76...851ad5b3 - 8 earlier commits
7cb7d510 - Merge branch '1.x' into 3406391-add-gitlab-ci-es
a59cb189 - Fixed assert
2333604e - Run all test jobs with ES.
fbdf138b - Added missing use statement.
34381911 - minor refactor
74636b4e - Merge branch '1.x' into 3406391-add-gitlab-ci-es
d26982e8 - PHPCS fix.
bb0b47d8 - Merge branch '3406391-add-gitlab-ci-es' into 3405873
21dd2099 - PHPCS fix.
a18e9610 - Merge branch '1.x' into 3405873

Compare with previous version

Couple of minor nits but looks good

added 5 commits

57fd6cea - 1 commit from branch project:1.x
06677762 - Refactoring...
db18f1fe - Merge branch '1.x' into 3405873
f28239c8 - Added @covers in tests.
9dd7f974 - Initialize Elastic client in a trait.

Compare with previous version

resolved all threads

We still need a copy of \Drupal\Tests\data_pipelines\Kernel\DestinationQueueTest::testCleanup and \Drupal\Tests\data_pipelines\Kernel\DestinationQueueTest::testOutdatedCleanup in \Drupal\Tests\data_pipelines_elasticsearch\Kernel\ElasticsearchDestinationQueueTest.

This is the only remaining bit. We are ready to merge after that.