Calendar events

[BarrelDevelopment]

Add a feature that allows calendar events to be removed after they have been added #1962
fixes #1962

• I have read the Contribution Guidelines
• I have commented on the issue above and discussed the intended changes
• A maintainer has signed off on the changes and the issue was assigned to me
• All newly added code is adequately covered by tests
• All existing tests are still running without errors
• The documentation was modified to reflect the changes OR no documentation changes are required.

Changes

• Add method in CalendarExtensions.cs to remove an existing calendar event.
• Add test cases to CalendarTests.c.s

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[BarrelDevelopment]

@microsoft-github-policy-service agree