[CONTP-1096] Document check_tag_cardinality in Kubernetes Autodiscovery annotations

[zhuminyi]

What does this PR do?

This PR documents the check_tag_cardinality parameter support in Kubernetes Autodiscovery annotations. Specifically:

1. Updates the "Per-check tag configuration" section in /getting_started/integrations/ to include a tabbed view showing both configuration file and Kubernetes annotation methods
2. Adds an "Advanced annotation parameters" section in /containers/kubernetes/integrations/ documenting the check_tag_cardinality annotation
3. Adds an info callout clarifying that check_tag_cardinality only affects integration check metrics, not DogStatsD metrics

Motivation

The Datadog Agent supports setting tag cardinality (check_tag_cardinality) on a per-check basis through both configuration files and Kubernetes Autodiscovery annotations. However, the public documentation only covered the config file usage and did not mention the Autodiscovery annotation support.

This PR closes that documentation gap by showing users how to use the annotation:
ad.datadoghq.com/<CONTAINER_NAME>.check_tag_cardinality: "<low|orchestrator|high>"

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/zhuminyi/CONTP-1096/containers/kubernetes/integrations
• https://docs-staging.datadoghq.com/zhuminyi/CONTP-1096/getting_started/integrations/