RFR: 8291444: GHA builds/tests won't run manually if disabled from automatic running [v2]

[Christoph Langer]

> This is an attempt to fix the issue reported in JDK-8291444.
> 
> The check for secrets.JDK_SUBMIT_FILTER should only be applied to the push event but not on e.g. workflow_dispatch.
> Currently setting JDK_SUBMIT_FILTER would lead to setting every platform to 'false', even when manually triggering the GHA run via workflow_dispatch.
> 
> I furthermore propose to relax the check for unknown events. In OpenJDK we only use/define workflow_dispatch and push. Other events would hence not trigger the workflow anyway. However, downstream vendors (like us in SapMachine) might use other events such as pull_request and they would then need to patch this away. This kind of downstream issue was also reported by [Amazon](https://mail.openjdk.org/pipermail/build-dev/2022-August/035102.html). If you agree, I would remove the commented lines 91-93. Otherwise I have to uncomment them.

Christoph Langer has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Remove commented lines
 - Merge branch 'master' into gha-events
 - JDK-8291444

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11365/files
  - new: https://git.openjdk.org/jdk/pull/11365/files/5369e338..d796fedd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11365&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11365&range=00-01

  Stats: 24102 lines in 710 files changed: 14002 ins; 6550 del; 3550 mod
  Patch: https://git.openjdk.org/jdk/pull/11365.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11365/head:pull/11365

PR: https://git.openjdk.org/jdk/pull/11365