fix: rename event loop to agent loop

[lizradway]

Description

• The team decided in Typescript going forward that we would abide by 'agent loop' naming
• I am implementing metrics using the 'agent loop' naming convention and wanted to clean this up for parity before metrics PRs

Bug fix

Testing

How have you tested the change?

• I ran npm run check

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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