feat: Update recurring events

[meetulr]

What kind of change does this PR introduce?

This PR completes the CRUD implementations of recurring events in the admin, by adding functionalities for updating recurring events and adjusting the existing recurring events code according to the latest changes in the api.

Issue Number:

Fixes #1643

Did you add tests for your changes?

Yes

Demo

updating-recurring-events.mp4

Does this PR introduce a breaking change?

This should be merged after this one in api: PalisadoesFoundation/talawa-api#2234

Additional Context

Recurring Events ADMIN issue: #1643
Recurring Events API issue: PalisadoesFoundation/talawa-api#1583

[github-actions]

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