fix: add DOMPurify to prevent XSS attacks in the way emojis are rendered

[julio-cfa]

Brief Title

This PR adds DOMPurify to certain dangerouslySetInnerHTML attributes, preventing XSS attacks in the way emojis are rendered.

Acceptance Criteria fulfillment

• Add DOMPurify to EmojiReaction.js and Emoji.js.

Fixes # (issue)

VLN-59

Video/Screenshots

N/A

[CLAassistant]

All committers have signed the CLA.

[Spiral-Memory]

Hey @julio-cfa,

Thank you so much for your contribution. I see you are a member of Rocket.Chat. I am just a GSoC Contributor. If you're concerned about Playwright failing, please don't worry. It is failing because it checks whether EmbeddedChat has some messages (in anonymous mode) using Abhinav's personal Rocket.Chat server, which I have changed to demo.qa (provided by devanshu for these purposes) in one of my PRs (which isn't merged yet).

Abhinav's personal Rocket.Chat server is no longer working, which is why the Playwright tests are failing.

Thank you!

[julio-cfa]

Hey @julio-cfa,

Thank you so much for your contribution. I see you are a member of Rocket.Chat. I am just a GSoC Contributor. If you're concerned about Playwright failing, please don't worry. It is failing because it checks whether EmbeddedChat has some messages (in anonymous mode) using Abhinav's personal Rocket.Chat server, which I have changed to demo.qa (provided by devanshu for these purposes) in one of my PRs (which isn't merged yet).

Abhinav's personal Rocket.Chat server is no longer working, which is why the Playwright tests are failing.

Thank you!

Thank you very much for the clarification, @Spiral-Memory! I thought it was some flaky tests misbehaving and tried to re-run them a couple of times to see if it would work, but now it makes sense why they weren't passing.

(And you're not "just a GSoC Contributor", GSoC contributors are super important to us <3)