Fix agent status text and json output

[GustavoCaso]

What does this PR do?

During the QA week we found a few irregularities on the agent status output. The original change was introduced in this PR https://github.com/DataDog/datadog-agent/pull/22115

This PR fixes the issues with the JSON output that was missing a few keys. Also, adds a No Transport Proxy Warnings text in the http proxy section in the case of no warnings.

Motivation

Additional Notes

Possible Drawbacks / Trade-offs

Describe how to test/QA your changes

Detail explanation on how to QA are provided on https://github.com/DataDog/datadog-agent/pull/22115 QA section.

I few notes:

• Check Runners: is no longer present in the text output
• System time: <Timestamp> is no longer present in the text output.
• Verbose: <Bool> is no longer present in the text and JSON output.
• complianceChecks is no longer present in the JSON output. That is only present in the security agent