Add overview dashboard to benchmark/zeebe-io clusters

[npepinpe]

Description

This PR adds the overview dashboard to the local monitoring testing set up, as well as to the zeebe-io/benchmark clusters setup. To update our existing Helm installations, you go to the benchmarks/docs/setup folder, then switch to the K8s context/namespace you want to update (e.g. the zeebe-io context and namespace default), then run:

helm upgrade metrics stable/prometheus-operator --atomic --reuse-values -f prometheus-operator-values.yml

You can see the overview dashboard is now in both the long running and the default cluster.

Related issues

closes #9075

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.

[Zelldon]

Awesome thanks so much @npepinpe 👍 🚀

[Zelldon]

Lol ok :D I thought there can only one default 😆

[npepinpe]

As bors is quiet and this has no impact on code, I'll just merge directly ;)