Backport of GitHub actions now uses branch local reusable tests into release/1.0.x

[thisisnotashwin]

Backport

This PR is auto-generated from #1915 to be assessed for backporting due to the inclusion of the label backport/1.0.x.

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

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Changes proposed in this PR:
Update github actions to use local branches reusable tests. We previously would import the reusable test from the main branch which caused confusion.

These changes have already been made to the release/0.49.x branch
see #1914

How I've tested this PR:
If the GHA CI runs then we are good to go

How I expect reviewers to test this PR:
👀

Checklist:

• [N/A] Tests added
• [N/A] 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

• 272445a