Restore jmx-fetch integration-core from #7588

[PerfectSlayer]

What Does This Do

Restore jmx-fetch integration-core from #7588

Motivation

Sub-module update notification was broken and an unexpected update went through. See #7610

Additional Notes

Contributor Checklist

• Format the title according the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any usefull labels
• Squash your commits prior merging or merge using GitHub's Squash and merge
• Don't use close, fix or any linking keywords when referencing an issue.
  Use solves instead, and assign the PR milestone to the issue
• Update the public documentation in case of new configuration flag or behavior

Jira ticket: [PROJ-IDENT]

[github-actions]

Hi! 👋 Looks like you updated a Git Submodule.
If this was not intentional please make sure to:

• Update the submodule to the latest commit on the master branch using the git submodule update command,
• Check you properly set up your environment for contributing.