Migrate zeebe repository to camunda organization

[npepinpe]

Description

This PR updates documentation and build scripts to point to the right repository, camunda/zeebe. It also renames the go module such that it's now accessible as github.com/camunda/zeebe/clients/go (though the redirects using the old URLs will still work).

NOTE: this will not work now as the CI will probably break at the moment, and we're still missing some credentials. This will be merged after the repository was migrated and we've the tests pass.

Related issues

closes #8914
blocked by #8912

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.