Add duration to to_next_epoch

[b-chu]

What does this PR do?

Adds duration to the to_next_epoch function to increment total_wct.

---

Stack:

• Add Iteration related Events #3019
• Deprecate get_state and remove deprecations #3017
• Add iteration to TimeUnit #3013
• Add duration to to_next_epoch #3012 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

What issue(s) does this change relate to?

Before submitting

• Have you read the contributor guidelines?
• Is this change a documentation change or typo fix? If so, skip the rest of this checklist.
• Was this change discussed/approved in a GitHub issue first? It is much more likely to be merged if so.
• Did you update any related docs and document your change?
• Did you update any related tests and add any new tests related to your change? (see testing)
• Did you run the tests locally to make sure they pass?
• Did you run pre-commit on your change? (see the pre-commit section of prerequisites)

[b-chu]

✓ Commit merged in pull request #3017