fix: replace scroll-bar with no-scrollbar in AvailableTimeSlots component

[KartikLabhshetwar]

What does this PR do?

• Fixes Visible scrollbar on booking page time slot selector creates visual clutter #26338
• Fixes CAL-7004

Visual Demo (For contributors especially)

Video Demo (if applicable):

before:

Screen.Recording.2025-12-31.at.2.47.48.PM.mov

after:

Screen.Recording.2025-12-31.at.2.48.28.PM.mov

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• 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.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

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Summary by cubic

Hide the visible scrollbar in the booking page time slot selector by switching to the no-scrollbar utility in AvailableTimeSlots. Scrolling still works; the UI is cleaner. Addresses CAL-7004 and #26338.

^{Written for commit a879f40. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

[dhairyashiil]

LGTM