Release 6.4.0 - Adaptive phase filter updates and documentation

[hjkristenson]

This release amends the code for the adaptive phase filter to accommodate a zero value to skip the filtering, and adds documentation in support of this parameter being exposed for customization by users ordering InSAR On Demand jobs.

TODO:

• [x] Validate the readme and metadata files for a test job

[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
• [ ] (If applicable) Updated the dependencies and indicated any downstream changes that are required
• [x] Added/updated documentation for these changes
• [ ] 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?

[jtherrmann]

Trufflehog can be safely ignored.