Remove events from pickle cache

[tkdrob]

Proposed change

Events were being saved to the pickle cache. This resulted in queries to S3 with expired credentials when there is no recordings available to get from AWS to replace the "current" event. Events are no longer saved to the pickle cache and are instead stored in memory.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass.
• There is no commented out code in this PR.
• The code has been formatted (make lint)
• Tests have been added to verify that the new code works.