Remove Datadog::Tracing::Contrib::HTTP::Instrumentation.after_request #3654

Job	Run time
build-and-publish-test-image	13s
test-negative (dd-lib-ruby-init-test-rails-conflict)	59s
test-negative (dd-lib-ruby-init-test-rails-bundle-deploy)	1m 4s
test (network, dd-lib-ruby-init-test-rails)	7m 2s
test (network, dd-lib-ruby-init-test-rails-explicit)	7m 13s
test (network, dd-lib-ruby-init-test-rails-gemsrb)	6m 51s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails)	7m 29s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails-explicit)	7m 41s
test (network, use-admission-controller, dd-lib-ruby-init-test-rails-gemsrb)	7m 43s
	46m 15s

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