Revert change to collect process dump after every test

[michel-laterman]

What does this PR do?

Revert a change made to collect a list of running processes after every test that was added as part of #5316

Why is it important?

Output is noisy

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[mergify]

This pull request does not have a backport label. Could you fix it @michel-laterman? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-./d./d is the label to automatically backport to the 8./d branch. /d is the digit

[mergify]

backport-v8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.

[michel-laterman]

Looks like we have a test failure unrelated to the changes:

=== FAIL: testing/proxytest TestProxy/mTLS_scenario,_client_and_server_cert_validation (31.35s)
--
  | proxytest_test.go:203: Starting proxytest with TLS
  | proxytest_test.go:235:
  | Error Trace:	C:/buildkite-agent/builds/bk-agent-prod-gcp-1729009863988762782/elastic/elastic-agent/testing/proxytest/proxytest_test.go:235
  | Error:      	Received unexpected error:
  | Get "http://somehost:1234/some/path/here": context deadline exceeded
  | Test:       	TestProxy/mTLS_scenario,_client_and_server_cert_validation
  | Messages:   	unexpected error return value

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube