Add project feature warning (10,000) and limit (30,000)

[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 #2184
Also related to #2190, based on @Sujanadh's debugging 🙏
Referenced in #1732

Describe this PR

A warning is displayed on the dataset upload / OSM fetch page if more than 10,000 features (the demo was set to 500 for testing in the screenshot):

An error is displayed on the dataset upload / OSM fetch page if more than 30,000 features (the demo was set to 500 for testing in the screenshot). The user is blocked from continuing:

During project creation, if there are more than 10,000 features, then the user receives a different prompt and the redirect takes 20 seconds to complete:

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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