[Backport 7.72.x] Diagnose command only sends to softinv endpoint when it is enabled (#42108)

Backport from #42107

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### What does this PR do?

Don't send diagnosis payloads to the softenv endpoint, unless it is enabled in the config.

### Motivation

#incident-44248

The endpoint returns 403 errors if the wrong api key is used, which the diagnose command will do because it blinds hits all defined endpoints.

### Describe how you validated your changes

### Additional Notes
(cherry picked from commit 04be725)

Co-authored-by: AliDatadog <125997632+AliDatadog@users.noreply.github.com>

Author: dustmop