Enable use of env vars for --resource-types and --exclude-resource-types

[gshank]

resolves #9237 (follow on pr)

Problem

The MultiOption ChoiceTuple param type didn't support env vars.

Solution

Fix ChoiceTuple to not split strings into characters

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.06%. Comparing base (2c1926c) to head (eb704a5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9779      +/-   ##
==========================================
- Coverage   88.11%   88.06%   -0.06%     
==========================================
  Files         178      178              
  Lines       22487    22497      +10     
==========================================
- Hits        19815    19812       -3     
- Misses       2672     2685      +13     

Flag	Coverage Δ
integration	85.45% <100.00%> (-0.12%)	⬇️
unit	61.79% <0.00%> (-0.03%)	⬇️

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