* Update active version list in .release/versions.hcl
* Remove nightly tests for 1.17.x
* Add nightly tests for 1.20.x
* Gate nightly tests for 1.19.x to Enterprise only
* Update CHANGELOG.md
* init release branch
* init 1.20 nightly tests
* drop 1.17 nightly tests for new release cycle
* drop 1.17 from test matrix
* Update nightly-test-integrations-1.20.x.yml
* Config changes to use backport-assistant with lts support
Co-authored-by: Michael Zalimeni <michael.zalimeni@hashicorp.com>
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Co-authored-by: claire labry <claire@hashicorp.com>
Co-authored-by: Michael Zalimeni <michael.zalimeni@hashicorp.com>