Fix invalid maintenance exclusion command

[tonyzhc]

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 flake

What this PR does / why we need it:
This is a follow up to #2203. The gcloud command was incorrect.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[sunnylovestiramisu]

Maybe do a manual test run in dev project to be sure about the correctness.

[tonyzhc]

Local run of test/run-k8s-integration-local.sh confirms that the command is correct.

I1016 18:02:23.815274  575953 utils.go:17] cmd args=[gcloud container clusters update pdcsi7cb6 --zone us-central1-b --quiet --add-maintenance-exclusion-name no-upgrades-during-test --add-maintenance-exclusion-start 2025-10-16T18:02:23Z --add-maintenance-exclusion-end 2025-10-16T20:02:23Z --add-maintenance-exclusion-scope no_upgrades]
Updating pdcsi7cb6...done.
Updated [https://container.googleapis.com/v1/projects/hanchiz-gke-dev/zones/us-central1-b/clusters/pdcsi7cb6].

[k8s-ci-robot]

@tonyzhc: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-e2e-arm	e87f0bb	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-arm
pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2022	e87f0bb	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2022

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[sunnylovestiramisu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sunnylovestiramisu, tonyzhc

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