[COST-4367] Allow legal entity setting for AWS and fix date issue

[cgoodfred]

To account for all of the HCS use cases, the legal entity should be settable for AWS generators. This also addresses a datetime.date issue where tzinfo is not an attribute on date objects, only datetime objects.

[codecov]

Codecov Report

Merging #481 (2591f1c) into main (d15b7ef) will increase coverage by 0.1%.
The diff coverage is 100.0%.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #481     +/-   ##
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+ Coverage   93.5%   93.6%   +0.1%     
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  Files         60      60             
  Lines       4625    4629      +4     
  Branches     663     664      +1     
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+ Hits        4324    4331      +7     
+ Misses       157     156      -1     
+ Partials     144     142      -2