fix: correct line-breaks in calendar event description

[michaelvalette]

What does this PR do?

Reviewing the function getRichDescription in CalEventParser and its sub-functions in the same file, in order to correct all those double/triple/quadruple line-breaks in the event descriptions. No functional change, just cleaning the UI.

BEFORE

AFTER

Also adding explicit output types on all functions.

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• [x] I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

To reproduce:

• Plug a calendar as organizer
• Book as a client
• Event should appear in calendar and shouldn't contain double/triple/quadruple line-breaks

Checklist

[vercel[bot]]

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[graphite-app[bot]]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (12/09/24)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (12/09/24)

1 label was added to this PR based on Keith Williams's automation.

"Add ready-for-e2e label" took an action on this PR • (12/11/24)

1 label was added to this PR based on Keith Williams's automation.

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Name	Status	Preview	Comments	Updated (UTC)
calcom-web-canary	❌ Failed (Inspect)			Dec 10, 2024 3:17pm

[github-actions[bot]]

E2E results are ready!

• Workflow #40858.1 latest results

[zomars]

This seems to be causing #17928 We're seeing an influx of errors on the cron executing for reminders with more than 24k logs in the last 2 days:

Error scheduling Email with error TypeError: Cannot read properties of undefined (reading 'trim')