[Watcher] Unskip component integration tests

[jloleysens]

After #51145 was merged we can remove the .skip from all of the component integration tests in watcher.

Preferably only after #50908 is merged .

[Update]
Only watch conditions inside watch_create_threshold.test.tsx needs to be revived.

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[alisonelizabeth]

Most of the tests were unskipped as part of #88225

There are still some flaky tests, tracked via #163532