feat: add format prop to TipTapEditor to support HTML content alongside markdown and include unit tests

[Abhishek-Punhani]

Summary

Added format prop to TipTapEditor to support HTML content alongside markdown and include unit tests

References

Fixes #5966

Reviewer guidance

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AI usage

Used Antigravity for final review and nitpicks.

[learning-equality-bot]

👋 Hi @Abhishek-Punhani, thanks for contributing!

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[AlexVelezLl]

Code changes look good, and manual QA checks out! :)