Backport of Pipeline Updates into release/1.1.x

[thisisnotashwin]

Backport

This PR is auto-generated from #1908 to be assessed for backporting due to the inclusion of the label backport/1.1.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul-k8s/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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If you go through my PR commit by commit it's easier to review, I typically add extra context and you won't see things change between commits unintentionally

Changes proposed in this PR:

• Upgrade Go version to 1.20 and specifically 1.20.1 to address a CVE
• Updated gotestsum calls to use testnames this improves debugging as you'll see which tests pass and fail, not just the package name with failing/passing tests
• Added 1.1.x release branch for nightly testing

How I've tested this PR:
I verified that the nightly tests passed:

How I expect reviewers to test this PR:
👀

Checklist:

• [N/A] Tests added
• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)

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Overview of commits

• f53baa3 - da67f3d - 47684b6 - cfdbacf - ac26dfa - dd6f630

[wilkermichael]

Closing I'm going to manually cherry-pick