Verify Hermes retry pending tx behavior with an end-to-end test

[seanchen1991]

Summary

Verify the fix implemented in #1951 with an end-to-end test.

Problem Definition

The behavior that #1951 addresses leads to subtle issues around pending tx resubmission that are difficult to debug. While the implemented fix has been tested manually, more rigorous testing would be helpful.

Proposal

Add an end-to-end test that verifies that the retrying mechanism for pending txs resubmits regenerated messages and not stale ones.

Acceptance Criteria

• The fix implemented in Fix Hermes retrying mechanism not regenerating messages #1951 has been adequately tested.

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate milestone (priority) applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[seanchen1991]

Closing this issue as #1951 addresses it by including an integration test for the fix.