[cinder-csi-plugin] Fix ControllerGetVolume multi-cloud iteration bug

[hemna]

What this PR does / why we need it:

In ControllerGetVolume, when multiple clouds are configured, the loop iterates over all clouds without breaking on success. If the volume is found in an earlier cloud but a subsequent cloud returns NotFound, the err variable is overwritten and the function erroneously returns NotFound despite having already located the volume.

This adds a break statement after a successful GetVolume call to stop iterating once the volume is found.

Which issue this PR fixes(if applicable):
fixes #

Special notes for reviewers:
Only affects multi-cloud configurations. Single-cloud setups are unaffected since the loop has only one iteration.

Release note:

[cinder-csi-plugin] Fix ControllerGetVolume returning NotFound for volumes that exist in multi-cloud configurations.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @hemna. Thanks for your PR.

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[kayrus]

/ok-to-test