Remove Datadog::Tracing::Contrib::HTTP::Instrumentation.after_request

[marcotc]

2.0 Upgrade Guide notes

The undocumented HTTP hook Datadog::Tracing::Contrib::HTTP::Instrumentation.after_request has been removed. This hook was intrusive, only restricted to the net/http client, and was not generalizable to other HTTP client gems.

If you require this hook, please open a "Feature request" stating your use case so we can asses how to best support it.

Additional Notes:

We are open to adding similar capabilities in the future, but we should asses the concrete user needs for such hook.

How to test the change?

All changes are covered by unit testing. In this case, the tests are removed due to the removal of the feature.

For Datadog employees:

• If this PR touches code that signs or publishes builds or packages, or handles
  credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (be1c557) 98.11% compared to head (9c3d405) 98.11%.

Additional details and impacted files

@@           Coverage Diff           @@
##              2.0    #3367   +/-   ##
=======================================
  Coverage   98.11%   98.11%           
=======================================
  Files        1248     1248           
  Lines       72285    72257   -28     
  Branches     3391     3384    -7     
=======================================
- Hits        70920    70894   -26     
+ Misses       1365     1363    -2     

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