Revert "[processorhelper] deprecating unused methods"

[djaglowski]

Reverts #11083

I'd like to propose that these metrics not be deprecated unless Accepted, Refused, and Dropped are also deprecated. These four metrics describe a complete picture of telemetry flowing through processors.

Personally I'd like to deprecate all four in favor of #10708 because the latter can be captured automatically.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.23%. Comparing base (3ed205e) to head (3b01a04).
Report is 19 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11114   +/-   ##
=======================================
  Coverage   92.23%   92.23%           
=======================================
  Files         414      414           
  Lines       19810    19810           
=======================================
  Hits        18271    18271           
  Misses       1167     1167           
  Partials      372      372           

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[djaglowski]

After discussing with @codeboten and @mx-psi, we agreed that the associated "accepted", "refused", and "dropped" metrics will also be deprecated.