CLI-1336: Isolate cache dir per test

[danepowell]

Motivation

Fixes #NNN

Proposed changes

Alternatives considered

Testing steps

1. Follow the contribution guide to set up your development environment or download a pre-built acli.phar for this PR.
2. Clear the kernel cache to pick up new and changed commands: ./bin/acli ckc
3. (add specific steps for this pr)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.74%. Comparing base (57a741f) to head (afabd42).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1747   +/-   ##
=========================================
  Coverage     91.74%   91.74%           
- Complexity     1816     1817    +1     
=========================================
  Files           121      121           
  Lines          6518     6521    +3     
=========================================
+ Hits           5980     5983    +3     
  Misses          538      538           

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[github-actions]

Try the dev build for this PR: https://acquia-cli.s3.amazonaws.com/build/pr/1747/acli.phar

curl -OL https://acquia-cli.s3.amazonaws.com/build/pr/1747/acli.phar
chmod +x acli.phar