Move docker tests into tests folder, fix nightly

[dereknola]

Proposed Changes

• Move docker tests into test directory

• Consolidate the out of date install test READMEs into a single document with up to date information.
• Fix nightly install tests (example failure)

Types of Changes

Code cleanup

Verification

GHA passes run, specifically
dapper -f Dockerfile --target dapper make test still works

Testing

Its all testing

Linked Issues

#5678

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.11%. Comparing base (b8dfafa) to head (87cc277).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6855   +/-   ##
=======================================
  Coverage   25.11%   25.11%           
=======================================
  Files          33       33           
  Lines        2839     2839           
=======================================
  Hits          713      713           
  Misses       2079     2079           
  Partials       47       47           

Flag	Coverage Δ
inttests	9.54% <ø> (ø)
unittests	17.75% <ø> (ø)

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