Refactor FXIOS-12469 [TA 2025] Update MockGleanWrapper functionality to test extras from multiple events fired in a single test

[ih-codes]

📜 Tickets

Jira ticket
Github issue

💡 Description

This PR updates our MockGleanWrapper to allow telemetry unit tests to capture extras from multiple events by making the extras an array. Also removes the unnecessary optional on the wrapper's events array.

Updated all the tests for these changes (trivial text replacements).

This is in preparation of being able to add unit tests for code that fires multiple events where we want to inspect the extras.

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If needed, I updated documentation and added comments to complex code
• If needed, I added a backport comment (example @Mergifyio backport release/v120)

[mobiletest-ci-bot]

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[cyndichin]

changes in MockGleanWrapper looks good! thanks for making this update!