Add svc account volume mount to prow jobs

[terryyylim]

What this PR does / why we need it:
New e2e test will involve the need for google cloud sdk auth inorder to access BQ table.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[pyalex]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pyalex, terryyylim, woop

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[feast-ci-bot]

@terryyylim: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
test-end-to-end-redis-cluster	6c161dc	link	/test test-end-to-end-redis-cluster

Full PR test history

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[feast-ci-bot]

@terryyylim: Updated the config configmap in namespace default at cluster default using the following files:

• key config.yaml using file .prow/config.yaml

In response to this:

What this PR does / why we need it:
New e2e test will involve the need for google cloud sdk auth inorder to access BQ table.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.