Add arm64 storage class matrix with io2-csi to global_config_arm64

[rabin-io]

What this PR does / why we need it:

Smoke tests on arm64 crash with IndexError during pytest_sessionstart because --storage-class-matrix=io2-csi is passed by the Jenkins job but io2-csi is not defined in the arm64 global config storage_class_matrix.

This adds the arm64-specific storage_class_matrix (with io2-csi as default) to tests/global_config_arm64.py, matching what cnv-4.19+ already have.

Traceback:

INTERNALERROR> File "utilities/pytest_utils.py", line 113, in config_default_storage_class
INTERNALERROR>     default_storage_class_configuration = [
INTERNALERROR>                                           ^
INTERNALERROR> IndexError: list index out of range

Which issue(s) this PR fixes:

Fixes new test-pytest-cnv-4.18-smoke-arm64 crash (zero tests ran)

Special notes for reviewer:

cnv-4.18 does not have TRIDENT_CSI_NFS constant, so only io2-csi and hostpath-csi-basic are included (unlike cnv-4.19+ which also has trident).

jira-ticket:

🤖 Generated with Claude Code

Assisted-by: Claude noreply@anthropic.com

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