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Fix failure to load volume plugins for #52048

Currently we have two plugin managers.
However one of them limits the cloud plugins it loads.
This means that if cloud provider is set to external the plugins will
not be loaded in *that* plugin manager. However they will be loaded in
the other instance of the plugin manager. So it does not actually save
us anything. It does hamper the efforts to actually get stage 1
separation working.

**What this PR does / why we need it**: It allows the plugins be found for the cloud providers working on stage 1 separation.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #52048 

**Special notes for your reviewer**:

**Release note**:
```release-note NONE
```