[SDTEST-437] implement auto test retries RFC

[anmarchenko]

What does this PR do?
Changes auto test retries functionality to conform to the latest RFC:

• rename env variables
• add a killswitch to disable it with local ENV
• add is_retry tag to internal telemetry to track retried tests

How to test the change?
Unit tests are provided

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.92%. Comparing base (1e85028) to head (de56d42).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #219   +/-   ##
=======================================
  Coverage   98.91%   98.92%           
=======================================
  Files         261      261           
  Lines       12310    12387   +77     
  Branches      558      559    +1     
=======================================
+ Hits        12177    12254   +77     
  Misses        133      133           

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