Use Matomo tracking web component, with accept/disagree prompt

[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 #942

Describe this PR

• Built on React v19 PR Upgrade React v18 --> v19 #1545, so required that to be merged first (actually only 2 lines of new code in this PR).
• Updated the Matomo code to use a @hotosm/ui web component instead.
• Also includes a user accept/disagree notice, which is required by law.

Screenshots

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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