[CI] DocsClientYamlTest regularly fails due to suite timeout

[hendrikmuhs]

DocsClientYamlTest ran into the suite timeout: https://gradle-enterprise.elastic.co/s/zepwthumo2am2/

Further investigation shows that timeout happened 12 times in the last 7 days, while there is no offending test that took a very long time:

https://gradle-enterprise.elastic.co/s/zepwthumo2am2/tests?test=DocsClientYamlTest

Conclusion: The sum of executed tests got big over time. The timeout is already set to 30 minutes which is quite high, increasing the limit might be a simple fix but maybe it's time to consider other options like splitting the suite into smaller parts.

[elasticmachine]

Pinging @elastic/es-docs (:Docs)

[elasticmachine]

Pinging @elastic/es-core-infra (:Core/Infra/Build)

[droberts195]

Also worth noting that the docs suite was the one timing out in #48148 (comment)

That was found to be because the docs suite happened to run in parallel with the server suite on the Mac CI workers - see #48148 (comment)

So it may be that on some other combinations of hardware/OS, the scheduling works out that the docs suite runs at the same time as the server suite.

[hendrikmuhs]

Since 20/01/13 the number of failures increased:

[hendrikmuhs]

Closing this issue in favor of #49753, although its a younger duplicate but the more interesting investigations and discussions happen there.