Allow reuse of shared actuators depending on BrokerClient

[npepinpe]

Description

This PR provides the last remaining bit to #9996 by having each application provide a BrokerClient bean, allowing us to create shared actuators which do not need any bridge. To showcase, the RebalancingService was collapsed into a single class.

Related issues

closes #9996
depends on #10354

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:

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• The behavior is tested manually
• The change has been verified by a QA run
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• The documentation is updated (e.g. BPMN reference, configuration, examples, get-started guides, etc.)
• New content is added to the release announcement
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[github-actions]

Test Results

   858 files  ±  0     858 suites  ±0   1h 50m 30s ⏱️ + 2m 52s
6 641 tests +41  6 630 ✔️ +41  11 💤 ±0  0 ❌ ±0 
6 825 runs  +41  6 814 ✔️ +41  11 💤 ±0  0 ❌ ±0 

Results for commit 78a584f. ± Comparison against base commit 870286d.

♻️ This comment has been updated with latest results.

[npepinpe]

Forgot to start the broker client on the actor scheduler is started. This is kind of hacky, as the StandaloneBroker also needs the client to be injected so it can start it after the actor scheduler.

[deepthidevaki]

💯 Looks great.
Just two minor comments. Please take a look before merging.

[npepinpe]

bors merge

[zeebe-bors-camunda]

Build succeeded:

• Go linting
• Test summary
• Java checks