Test: Create tests for src/helpers/event/deleteEventHelpers/deleteRecurringEvent.ts

[palisadoes]

We will need unittests done for all methods, classes and functions found in this file.

Any widgets, components, modals referenced in this file must also have unittests done

PR Acceptance Criteria

• When complete this file must show at least 100% coverage when merged into the code base.
• The current code coverage for the file can be found here
• The PR will show a report for the code coverage for the file you have added. You can use that as a guide
• Please coordinate issue assignment and PR reviews with the contributors listed in this issue Student Internship Programs talawa#359

[meetulr]

I should take this. This needs to work properly for my upcoming PRs in admin. PalisadoesFoundation/talawa-admin#1643

This PR #2032 was supposed to integrate the deleteRecurringEvent functionalities into develop-userTypeFix. But it removed all the tests😅, so the functionalities remained untested.

I'll add those back with the latest changes for appUserProfile. The PR is ready, please assign this issue to me.

Also, this would cover the tests for deleteRecurringEventInstances.ts (issue #2053), as that file is just exporting a function that's being used only in deleteRecurringEvent.ts (this issue). So, we should close that issue.