Migrate disabled alert config

[rooneyshuman]

Review Guide

This PR migrates grafana_asserts_suppressed_assertions_config from SDKv2 to the Plugin Framework.

resource_disabled_alert_config.go - standard Framework rewrite. Notable:

• disabledAlertConfigResource holds *assertsapi.APIClient and int64 stackID directly, injected via Configure
• id is a new computed attribute with UseStateForUnknown() (set to name on read, consistent with other asserts resources)
• name retains RequiresReplace() — equivalent to the previous ForceNew: true
• match_labels is schema.MapAttribute{ElementType: types.StringType}, populated with types.MapValueFrom
• Private put helper handles upsert via PutDisabledAlertConfig
• Private read helper retains eventual-consistency retry via withRetryRead (SDKv2 helper/retry aliased as sdkretry)
• ImportState implemented using the read helper rather than resource.ImportStatePassthroughID, so import populates the full model

docs/ - generated; make docs produces no changes to the asserts suppressed assertions config page.

Issue ref

https://github.com/grafana/deployment_tools/issues/542767

[github-actions]

In order to lower resource usage and have a faster runtime, PRs will not run Cloud tests automatically.
To do so, a Grafana Labs employee must trigger the cloud acceptance tests workflow manually.

[rooneyshuman]

@codex review

[chatgpt-codex-connector]

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[jgehrett]

I'm new to this codebase so asked Claude for some help. I only have a couple questions / suggestions

[jgehrett]

LGTM