Don't ping previous checkpoint missing if pool was paused during prev…

[slundqui]

…ious checkpoint timestamp

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 13.63636% with 19 lines in your changes missing coverage. Please review.

Project coverage is 81.80%. Comparing base (5654bd8) to head (3b20dcd). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/agent0/hyperfuzz/system_fuzz/invariant_checks.py	9.09%	10 Missing :warning:
...c/agent0/ethpy/hyperdrive/interface/_event_logs.py	11.11%	8 Missing :warning:
...gent0/ethpy/hyperdrive/interface/read_interface.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1689 +/- ## ========================================== + Coverage 81.67% 81.80% +0.13% ========================================== Files 99 99 Lines 7629 7646 +17 ========================================== + Hits 6231 6255 +24 + Misses 1398 1391 -7 ``` | [Flag](https://app.codecov.io/gh/delvtech/agent0/pull/1689/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/delvtech/agent0/pull/1689/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech) | `81.80% <13.63%> (+0.13%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech#carryforward-flags-in-the-pull-request-comment) to find out more.

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