Add PVCViewer Frontend Integration

[TobiasGoerke]

As discuseed in #6876, I've integrated the PVCViewer into the volumes UI.

You may test this by deploying the PVCViewer (make sure to merge/apply #7178 first) and the changed volumes UI.

[TobiasGoerke]

/assign kimwnasptd

[kimwnasptd]

@TobiasGoerke could you do one more rebase here as well to make sure all tests are running as expected?

[TobiasGoerke]

@TobiasGoerke could you do one more rebase here as well to make sure all tests are running as expected?

Done. Looking good.
Btw, can you manually trigger the backend docker pipeline, now that it is fixed?

[kimwnasptd]

Looks good! Nice to see a dedicated button as well for stopping the viewer

/lgtm
/approe

[kimwnasptd]

/approve

[google-oss-prow]

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