fix: incorrect booking seats full error on collective seated event

[kart1ka]

What does this PR do?

This issue occurs because the backend compares the total number of attendees (team members + booked seats) to the total number of seats per slot, instead of comparing the actual booked seats to the total number of seats per slot.

• Fixes Incorrect All Seats Booked Error for Collective Team Seated Events #15600 (GitHub issue number)
• Fixes CAL-XXXX (Linear issue number - should be visible at the bottom of the GitHub issue description)

https://www.loom.com/share/ff752121048b4e18a1ad64026963347d?sid=6686b5a4-d39f-4019-8122-c27630ae66db

Mandatory Tasks (DO NOT REMOVE)

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

How should this be tested?

1. Create a collective team seated event with a total of 3 seats.
2. Assign 3 team members to attend the event.
3. Book 1 seat for the event.
4. Attempt to book an additional seat for the same slot.
5. Notice the second booking is successful.

[vercel]

@kart1ka is attempting to deploy a commit to the cal Team on Vercel.

A member of the Team first needs to authorize it.

[graphite-app]

Graphite Automations

"Add community label" took an action on this PR • (06/27/24)

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

"Add consumer team as reviewer" took an action on this PR • (06/27/24)

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

[Udit-takkar]

@kart1ka Could you also add unit tests for this bug fix?

[kart1ka]

@kart1ka Could you also add unit tests for this bug fix?

Hi @Udit-takkar

I have added the unit test.