Release v7.0.0

[jtherrmann]

This will likely be a major release because it will add two new required CLI options / environment variables (for the ESA creds), so will break existing workflows.

TODO:

• [x] Add Changelog entry
• [x] Address TODO items in the PR:
  • [x] Pin to latest hyp3lib (v2)
  • [x] Implement more robust interface for ESA creds
• [x] Verify test rtc and insar jobs succeed
• [x] Merge https://github.com/ASFHyP3/hyp3/pull/1927

[github-actions[bot]]

Developer checklist

• [x] Indicated the level of changes to this package by affixing one of these labels:
  • major -- Major changes to the API that may break current workflows
  • minor -- Minor changes to the API that do not break current workflows
  • patch -- Patches and bugfixes for the current version that do not break current workflows
  • bumpless -- Changes to documentation, CI/CD pipelines, etc. that don't affect the software's version
• [x] (If applicable) Updated the dependencies and indicated any downstream changes that are required
• [x] Added/updated documentation for these changes
• [x] Added/updated tests for these changes

Reviewer checklist

• [x] Have all dependencies been updated?
• [x] Is the level of changes labeled appropriately?
• [x] Are all the changes described appropriately in CHANGELOG.md?
• [x] Has the documentation been adequately updated?
• [x] Are the tests adequate?

[forrestfwilliams]

Code changes look good, but I think we should run some example jobs