Preview checkpoint call before transacting in checkpoint bots

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.29%. Comparing base (aa48676) to head (6ca32a4).

Files	Patch %	Lines
src/agent0/ethpy/base/transactions.py	50.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1565 +/- ## ========================================== + Coverage 81.26% 81.29% +0.03% ========================================== Files 98 98 Lines 7093 7095 +2 ========================================== + Hits 5764 5768 +4 + Misses 1329 1327 -2 ``` | [Flag](https://app.codecov.io/gh/delvtech/agent0/pull/1565/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/1565/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=delvtech) | `81.29% <50.00%> (+0.03%)` | :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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