Ensure the the logs template has been processed

[gmarouli]

We use GET _cluster/health?wait_for_events=LANGUID&wait_for_status=green to ensure the index templates from the registry have been processed.

Closes: #99764
Closes: #99734
Closes: #97795
Closes: #99911

This did not work only for the following case which was converted to a java rest case. The reason that this didn't work was that the cluster health will be requested too early and the logs template wasn't submitted yet. Adding another cluster health request would work but it felt tedious.

Closes: #98163

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[gmarouli]

@elasticmachine update branch

[gmarouli]

I will split this into different PRs because it has grew quite a bit.

• Replace the disabled stack templates yaml test with java rest test #99978
• Replace 200_logs_datastream_defaults.yml with java rest test #99979
• Replace 210_logs_custom_mappings.yml with java rest test (#99734) #100006
• Replace 220_logs_default_pipeline.yml with java rest test (#99764) #100014