[SDTEST-635] Enable agentless telemetry when library is running in agentless mode

[anmarchenko]

What does this PR do?
Instead of disabling internal telemetry when running agentless, we use the new agentless mode to send metrics directly to the intake

Motivation
Agentless mode for telemetry was released in datadog gem v2.3

How to test the change?
Tested using sidekiq fork locally:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.92%. Comparing base (9a9877f) to head (7d3eee0).

Additional details and impacted files

@@                       Coverage Diff                        @@
##           anmarchenko/bump_datafog_to_2.3     #221   +/-   ##
================================================================
  Coverage                            98.92%   98.92%           
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  Files                                  261      261           
  Lines                                12386    12391    +5     
  Branches                               559      560    +1     
================================================================
+ Hits                                 12253    12258    +5     
  Misses                                 133      133           

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