redact secret_paths from elastic-agent inspect output

[michel-laterman]

What does this PR do?

redact secret_paths from elastic-agent inspect output.
elastic-agent inspect will now redact the value for any key in the secret_paths array.
secret_paths is expected to be part of the policy.

Why is it important?

displaying secrets is to be avoided

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

Disruptive User Impact

Output of elastic-agent inspect will change. Any workflow that uses this command to extract secret values will be broken.

[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.

[ycombinator]

@lucabelluccini Heads up for Support on the disruptive user impact due to this change.

[blakerouse]

Looks good and has good test coverage.

[rowlandgeoff]

Rerunning the failed Sonar steps in the PR got this unblocked

[michel-laterman]

Looks like an integration test is failing:

>>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): container_cmd_test.go:261:
--
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): Error Trace:	/home/ubuntu/agent/testing/integration/container_cmd_test.go:261
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): Error:      	Condition never satisfied
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): Test:       	TestContainerCMDWithAVeryLongStatePath/small_path
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): Messages:   	Elastic-Agent did not report healthy. Agent status error: "<nil>", Agent logs
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): agent container initialisation - chown paths
  | >>> (linux-amd64-ubuntu-2404-container) Test output (sudo) (stdout): Warning: failed to walk path /tmp/foo/bar: lstat /tmp/foo/bar: no such file or directory

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
87.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube