Replace pwa in manager frontend with dummy service worker (prep for removal)

[spwoodcock]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧑‍💻 Refactor
• ✅ Test
• 🤖 Build or CI
• ❓ Other (please specify)

Describe this PR

• The caching from the PWA on the manager frontend prevents loading the /mapnow/ID/ URLs for the mapper frontend.
• We don't actually need a PWA for the manager frontend anymore - this will eventually be transferred to the mapper frontend only.
• To facilitate this I added configure to create a dummy service worker that's purpose is to unregister the old service worker.
• Users that visit FMTM will have the PWA service worker removed, so they can correctly load the mapper frontend.
• Later on, the PWA can be removed entirely (once this is pushed through to prod and most users have unregistered the old service worker / or had it expire).

@manjitapandey hopefully the fix for your demo tomorrow 👍

Review Guide

Notes for the reviewer. How to test this change?

Checklist before requesting a review

• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
• 📖 Read the HOT Code of Conduct: https://docs.hotosm.org/code-of-conduct
• 👷‍♀️ Create small PRs. In most cases, this will be possible.
• ✅ Provide tests for your changes.
• 📝 Use descriptive commit messages.
• 📗 Update any related documentation and include any relevant screenshots.

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