Correct assertions on profiling action cancel

[danielmitterdorfer]

With this commit we address two issues when testing cancellation of the profiling task:

1. We add the actual profiling task to the list of tasks to check, not only its child tasks.
2. The original test contained a race where child tasks might have been unregistered (expectedly) in between collecting tasks and checking for cancelled tasks. Now we only check all remaining tasks have been cancelled.

Closes #92039

[elasticsearchmachine]

Pinging @elastic/es-search (Team:Search)

[DaveCTurner]

I've muted this test for now in main since it seems to fail enough to warrant it and Luca might not get to this review today. I've also pushed a commit to this PR branch which unmutes it.

[javanna]

LGTM thanks a lot for jumping on this.

[danielmitterdorfer]

Thanks for the review! There was one test failure in elasticsearch-ci/packaging-tests-windows-sample:

18:45:39 Could not determine the dependencies of task ':x-pack:plugin:ml:explodedBundlePlugin'.
18:45:39 > Could not resolve all files for configuration ':x-pack:plugin:ml:nativeBundle'.
18:45:39    > Could not download ml-cpp-8.7.0-SNAPSHOT-deps.zip (org.elasticsearch.ml:ml-cpp:8.7.0-SNAPSHOT)
18:45:39       > Could not get resource 'https://artifacts-snapshot.elastic.co/ml-cpp/8.7.0-SNAPSHOT/downloads/ml-cpp/ml-cpp-8.7.0-SNAPSHOT-deps.zip'.
18:45:39          > Premature end of Content-Length delimited message body (expected: 340,418,397; received: 2,097,136)

As this change is completely unrelated, the failure above is transient and all subsequent builds of elasticsearch-ci/packaging-tests-windows-sample, I'll merge this now.