Remove VAC name from Driver name

[amacaskill]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation

/kind failing-test

/kind feature
/kind flake

What this PR does / why we need it:
Some VAC tests are failing because of

{  [FAILED] While creating new VolumeAttributesClass: VolumeAttributesClass.storage.k8s.io "volume-modify-4528-e2e-vac-invalidvqcvs" is invalid: driverName: Invalid value: "csi-gcepd-sc-hdb--no-vsc--hdb-volumeattributesclass-volume-modify-4528": name part must be no more than 63 characters

This just removes VAC name from driver name
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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This pull-request has been approved by: amacaskill

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[amacaskill]

/retest

[amacaskill]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e

[pwschuurman]

/lgtm

[amacaskill]

/test pull-gcp-compute-persistent-disk-csi-driver-e2e

[pwschuurman]

/lgtm