Scheduling timezone fix

[TusharBhatt1]

What does this PR do?

• Fixes [CAL-5127] Issues with scheduling timezone change without end time #19095

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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[github-actions]

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (02/20/25)

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

"Add community label" took an action on this PR • (02/20/25)

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

[TusharBhatt1]

Closing this PR as the contributor has incorporated the suggested changes into their PR #19103