[Session test fixes] Fix window bug and make E2E session test deterministic

[Olshansk]

Summary

Make make test_e2e_session by:

• Fixing a bug in GetClaimWindowCloseHeight where we were not adding things correctly leading to incorrect windows
• Fix a flaky unit test in session.feature because the Proof would be deleted on-chain before the e2e testing client queried it for validation; switching to replayable events.
• Add an example of how we can query and listen for any on-chain event to improve future tests

Issue

• This was a blocker to iterate on #542

Type of change

Select one or more:

• [x] New feature, functionality or library
• [x] Bug fix
• [ ] Code health or cleanup
• [ ] Documentation
• [ ] Other (specify)

[github-actions[bot]]

The CI will now also run the e2e tests on devnet, which increases the time it takes to complete all CI checks.

You may need to run make trigger_ci to submit an empty commit that'll trigger the tests.

GCP workloads (requires changing the namespace to 607)) Grafana network dashboard for devnet-issue-{issue-id}

[Olshansk]

Merging in w/ this one flaky test: