Filter out test data produced by test publisher

To prevent test data reaching Find production, Publish will now filter those datasets out, the test data should still be available on staging Find.

This release also deploys a number of dependabot updates and a number of dependency and test fixes.

Reduce `MAX_DELETIONS` threshold limit

Merge pull request #907 from alphagov/reduce-max-deletions-threshold

Lower threshold of MAX_DELETIONS limit

v2.2.1: Merge pull request #899 from alphagov/remove-frontend-deploy-travis

Remove frontend deployment from travis

v2.2.0: Merge pull request #896 from alphagov/only-deploy-workers

Don't deploy the frontend as its not in use

2.1.5: Merge pull request #860 from alphagov/increase-app-memory

Increase app memory on staging and production

2.1.4: Merge pull request #805 from alphagov/set-max_deletions-100

Set MAX_DELETIONS limit to 100

Increase `MAX_DELETIONS` to allow removal of duplicates

2.1.3

Merge pull request #804 from alphagov/temp-up-max-deletions-fix-dupli…

Update ruby gems (dependabot PRs)

Bump elasticsearch-model from 5.0.1 to 6.0.0 (#787)

Bump elasticsearch-model from 5.0.1 to 6.0.0

Update ruby gems

Merge various dependabot PRs

Update ruby version to 2.6.3

Update ruby version to 2.6.3 (#770)

Update ruby version to 2.6.3