Allow rp endpoint override

[breburdaTom]

Allows the same behaviour for rp_endpoint flag (when defined in pytest.ini for example) as is currently for rp_api_key - which is the ability to be overridden by an environment variable.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.73%. Comparing base (8a5f39b) to head (a61e4fa).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #402   +/-   ##
========================================
  Coverage    69.73%   69.73%           
========================================
  Files            6        6           
  Lines         1381     1381           
========================================
  Hits           963      963           
  Misses         418      418           

Flag	Coverage Δ
unittests	69.73% <100.00%> (ø)

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[breburdaTom]

Hello @HardNorth - thx for merging. When can I expect a new release? I see they happen less than once a mont...
Asking if I should implement a workaround on my side until it's released, or if I can expect a new release soon. :)

(asking because I would need this change for something I am working on right now)