Fix raw pointer log in EnableFastSnapshotRestores

[torredil]

What type of PR is this?

/kind bug

What is this PR about? / Why do we need it?

Currently, there is a logging issue in cloud.EnableFastSnapshotRestores which surfaces because the existing code is printing out raw pointers from the error structures rather than their underlying string values. With this cc, we explicitly extract the error code and error message from each failed FSR operation and consolidate them into a single, readable error message.

How was this change tested?

Exceed the regional FSR limit to induce the error, which can be reviewed by looking at the controller logs.

Without this patch:

E0210 16:42:42.944417       1 driver.go:108] "GRPC error" err="rpc error: code = Internal desc = Failed to create Fast Snapshot Restores for snapshot ID \"snapshot-1c0d40ba-7170-40e9-aac0-ccf9b8cd004d\": failed to create fast snapshot restores for snapshot snap-08e035467a65daf9f: [{[{0xc00080f650 0xc00092b668 {}}] 0xc00080f680 {}}]"

With this patch:

E0210 18:32:56.934997       1 driver.go:108] "GRPC error" err="rpc error: code = Internal desc = Failed to create Fast Snapshot Restores for snapshot ID \"snapshot-1c0d40ba-7170-40e9-aac0-ccf9b8cd004d\": Error Code: FastSnapshotRestoreLimitExceeded, Error Message: Your account's regional limit would be exceeded by your request to enable fast snapshot restore on snapshot 'snap-02946ca3646445835' in Availability Zone 'us-east-1f'"

Does this PR introduce a user-facing change?

NONE

[github-actions]

Code Coverage Diff

File	Old Coverage	New Coverage	Delta
github.com/kubernetes-sigs/aws-ebs-csi-driver/pkg/cloud/cloud.go	88.9%	88.4%	-0.5

[ElijahQuinones]

/lgtm
/approve

[k8s-ci-robot]

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This pull-request has been approved by: ElijahQuinones

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