Validate project notifications rule data

- [ ] Skip empty filter-words (test: `addad,adada,,,` -> ['addad', 'adada','','',''])
- [ ] Validate email endpoint
- [ ] Validate slack endpoint
- [ ] Validate telegram endpoint

No files or tests are named. Start by locating the project notification rule input or schema and its existing validation tests, then inspect how filter-words and the email, Slack, and Telegram endpoints are parsed. Done means empty filter-word entries and all three endpoint values are validated by tests.

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