Add Overridable wrapper to CommunitiesManagement component

[mkloeppe]

Description

I added an Overridable wrapper around CommunitiesManagement.js that lets you Override the component if needed.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).
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Frontend

• I've followed the CSS/JS and React guidelines.
• I've followed the web accessibility guidelines.
• I've followed the user interface guidelines.

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1. You license your contribution under the same terms as the current repository’s license.
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[github-actions]

This PR was automatically marked as stale.