feat(project): populate total task field after task creation

[Anuj-Gupta4]

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: total_tasks field is not caluclated on the backend #2223

Describe this PR

Populate total tasks in the project after task creation.

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• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
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• ✅ Provide tests for your changes.
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• 📗 Update any related documentation and include any relevant screenshots.

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[spwoodcock]

Nice work!

Could you also write a migration to calculate the field for all existing projects in the db? 🙏

Basically the same SQL logic, but with a check to see if the field is populated first