[Mentions v2] Add new rule in ExpensiMarks for room mentions

[rlinoz]

Room mentions need a new html tag to work, which will be <mention-report>, we need to update our ExpensiMarks rules to find room mentions and replace them with the new tag.

Things to keep in mind:

• A message can have more than 1 room mention
• Room names consist of text connected with one or more hyphens and no spaces at all

Details and regex can be found here in the Mentions v2 design doc.

[melvin-bot]

Triggered auto assignment to @sakluger (NewFeature), see https://stackoverflowteams.com/c/expensify/questions/14418#:~:text=BugZero%20process%20steps%20for%20feature%20requests for more details.

[melvin-bot]

⚠️ It looks like this issue is labelled as a New Feature but not tied to any GitHub Project. Keep in mind that all new features should be tied to GitHub Projects in order to properly track external CAP software time ⚠️

[robertKozik]

Hi! Please assign me to this one - PR will be ready EOD