Replace custom ODK submission media upload with official external storage (S3)

[spwoodcock]

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

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

Related Issue

Related to
#1875
#1701
will impact
#1706

Describe this PR

• Configure Central so submission media automatically syncs to S3 (24hr schedule).
• Optionally trigger the sync on a more frequent interval (perhaps whenever submissions are requested).
• Implement some additional async functions in osm-fieldwork OdkCentralAsync to handle getting all pre-signed URLs for media attached to a submission.
• Replace custom logic in backend API with logic from osm-fieldwork to get the submission media pre-signed URLs via S3.
• Return the pre-signed URLs to the frontend for display.

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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