Remove debug log noise from event_monitor

[ancazamfir]

Closes: #XXX

Description

When running with log_level = 'debug' there is a lot of debug log noise. Even with the changes in this PR, the log is full of:

2023-05-29T14:07:40.225325Z DEBUG ThreadId(44) event_monitor{chain=ibc-1}: deadline has elapsed
2023-05-29T14:07:40.983320Z DEBUG ThreadId(45) event_monitor{chain=ibc-2}: deadline has elapsed

not sure where these are coming from and how to disable.

Started to see this after v1.5.0.

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).