DM-48633 : Support Arbitrary Constraints in Condor Queries

[tcjennings]

• Adds --constraint parameter to AllocateParser so additional arbitrary constraints can be added to HTCondor queries for idle jobs for which to allocate resources. The parameter can be used multiple times to add more constraints. All constraints are && together.
• Adds README, COPYRIGHT, and LICENSE files to the repo.
• Support standard environment variables for condor info config if USER or HOME not specified in a condor-info file.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 21.07%. Comparing base (a8b7495) to head (f2001c2).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/execute/allocator.py	0.00%	4 Missing ⚠️
python/lsst/ctrl/execute/slurmPlugin.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #35      +/-   ##
==========================================
- Coverage   21.17%   21.07%   -0.10%     
==========================================
  Files          15       15              
  Lines         699      707       +8     
  Branches       64       67       +3     
==========================================
+ Hits          148      149       +1     
- Misses        547      554       +7     
  Partials        4        4              

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