fix: update cleanup circle contexts, remove unnecessary branches

[alharris-at]

Description of changes

We were using the wrong contexts for our setup job for e2e cleanup. Updating those, and removing the interim branches we were using during migration.

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)
• New AWS SDK calls or CloudFormation actions have been added to relevant test and service IAM policies

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Merging #461 (0bac1bd) into main (dbd2228) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #461   +/-   ##
=======================================
  Coverage   72.08%   72.08%           
=======================================
  Files         208      208           
  Lines       13471    13471           
  Branches     3200     3200           
=======================================
  Hits         9710     9710           
  Misses       3454     3454           
  Partials      307      307           

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[AaronZyLee]

Confirmed that the context is added in circleci. LGTM 🚢