allow multi-setting for classifications and excludes

[modular-magician]

Fixes #13158

If this PR is for Terraform, I acknowledge that I have:

• run make lint on both ga and beta providers
• run make test on both ga and beta providers
• run testacc for osconfig service on both ga and beta providers

Release Note Template for Downstream PRs (will be copied)

osconfig: fixed no more than one setting is allowed under `patch_config.windows_update` on `google_os_config_patch_deployment`

Derived from GoogleCloudPlatform/magic-modules#8988

[github-actions]

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