Add variables to ease separate bucket config

[davidmirror-ops]

Tracking issue

Closes #4291

Why are the changes needed?

Closing #4759 in favor of this simpler implementation achieving the same goal.

What changes were proposed in this pull request?

How was this patch tested?

Deployed on a live EKS cluster,a wf execution correctly stored closure on metadata bucket and offloaded outputs to user bucket.

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.10%. Comparing base (ba86c69) to head (87dbc18).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5015      +/-   ##
==========================================
- Coverage   59.11%   59.10%   -0.02%     
==========================================
  Files         645      645              
  Lines       55574    55574              
==========================================
- Hits        32852    32846       -6     
- Misses      20129    20135       +6     
  Partials     2593     2593              

Flag	Coverage Δ
unittests	59.10% <ø> (-0.02%)	⬇️

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