test(dispatcher): fix potential sigsev in tests

[npepinpe]

Description

Ensure all actors which access the dispatcher (and cache parts of the direct buffer) are closed before the dispatcher is closed itself.

Related issues

closes #10407

Definition of Done

Not all items need to be done depending on the issue and the pull request.

Code changes:

• The changes are backwards compatibility with previous versions
• If it fixes a bug then PRs are created to backport the fix to the last two minor versions. You can trigger a backport by assigning labels (e.g. backport stable/1.3) to the PR, in case that fails you need to create backports manually.

Testing:

• There are unit/integration tests that verify all acceptance criterias of the issue
• New tests are written to ensure backwards compatibility with further versions
• The behavior is tested manually
• The change has been verified by a QA run
• The impact of the changes is verified by a benchmark

Documentation:

• The documentation is updated (e.g. BPMN reference, configuration, examples, get-started guides, etc.)
• New content is added to the release announcement
• If the PR changes how BPMN processes are validated (e.g. support new BPMN element) then the Camunda modeling team should be informed to adjust the BPMN linting.

Please refer to our review guidelines.

[deepthidevaki]

👍

[github-actions]

Test Results

   933 files  ±  0     933 suites  ±0   2h 3m 46s ⏱️ - 1m 26s
7 367 tests  - 10  7 357 ✔️  - 10  10 💤 ±0  0 ❌ ±0 
7 555 runs   - 10  7 545 ✔️  - 10  10 💤 ±0  0 ❌ ±0 

Results for commit 507e45a. ± Comparison against base commit c0b3ffc.

[deepthidevaki]

bors r+

[zeebe-bors-camunda]

Build failed:

• Test summary

[npepinpe]

bors r+

Some flaky integration tests, but nothing related to these changes

[zeebe-bors-camunda]

Build succeeded:

• Java checks
• Test summary
• Go linting

[backport-action]

Successfully created backport PR #10546 for stable/8.0.