## Description
Iterator Removal from Event Resolver.
The iterator overhead contributes to the complexities of the GC backup pipeline. Issue 1486's goal is to remove errors that are populated from non-error scenarios (e.g. container no longer exists).
- Stage 1: Reduce the number of error clauses in `Populate()` function
- Stage 2: Update the M365ID retrieval process per resolver
PR introduces Iterate approach used in `delta` functionality to populate the event calendar resolver. Reduces the amount of calls and variable creation during the populate function. The increase in efficiency will reduce the amount of time `concurrent` Mailbox queries are being made (application throttling).
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## Type of change
<!--- Please check the type of change your PR introduces: --->
- [x] 🌻 Feature
- [x] 🐹 Trivial/Minor
## Issue(s)
Related to #1486
## Test Plan
- [x] ⚡ Unit test
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