[Enhancement] Update fake client to match the actual API behaviour for ResizeVolume method

[Praveen005]

Summary

If we see the fake client implementation of ResizeVolume method, it only errors out in one situation when the volume we are looking for is not there (throws ZeroMatchesError). But on the API side, we can see that it can throw error for various other reasons (e.g., retry errors, VolumeResizeOnlineError and other upstream errors)

civogo/fake_client.go

Lines 1290 to 1300 in 21b9e19

	func (c *FakeClient) ResizeVolume(id string, size int) (*SimpleResponse, error) {
	for i, volume := range c.Volumes {
	if volume.ID == id {
	c.Volumes[i].SizeGigabytes = size
	return &SimpleResponse{Result: "success"}, nil
	}
	}
	err := fmt.Errorf("unable to find volume %s, zero matches", id)
	return nil, ZeroMatchesError.wrap(err)
	}

More context can be found in conversations under the PR: civo/civo-csi#46

Acceptance criteria:

1. Update fake client to match the actual API behaviour for ResizeVolume method.