Fix Model Armor sample path

[Haihan-Jiang]

Fixes #1713.

The Model Armor sample had a directory named model-armor-guardrail with a trailing space. Paths like that are easy to miss on Unix-like systems and can break checkout on platforms that reject trailing spaces in path components.

This moves the sample manifest into model-armor-guardrail/ and also fixes the manifest indentation so the YAML parses cleanly.

Validation:

• parsed ai-ml/gke-model-armor/model-armor-guardrail/model-armor-extension.yaml with Ruby YAML
• checked the git file list for path components with leading or trailing spaces
• git diff --cached --check

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• ai-ml/gke-model-armor/model-armor-guardrail/model-armor-extension.yaml:15, tag gke_aiml_gke_model_armor_model_armor_extension

You are about to delete 1 region tag.

• [ai-ml/gke-model-armor/model-armor-guardrail /model-armor-extension.yaml:15](https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/744e5b3c38b6f18d761a8a250770a98400a77090/ai-ml/gke-model-armor/model-armor-guardrail /model-armor-extension.yaml#L15), tag gke_aiml_gke_model_armor_model_armor_extension

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