Update gcp oidc docs

[seanyeh]

Proposed changes

Make oidc gcp docs clearer - it should be project number, not id

Unreleased product version (optional)

Related issues (optional)

[claude]

Review Feedback

✅ Accurate technical change: The change from project-id to project-number is correct. The gcp-login provider requires the numerical project number (e.g., 123456789), not the string project ID (e.g., my-project-name), as confirmed in the official provider documentation.

⚠️ Inconsistency to address:

Line 61 still references "project ID" but should be updated for consistency:

Make a note of the project ID, workload identity pool ID, provider ID, and service account email address from the previous steps.

Should be changed to:

Make a note of the project number, workload identity pool ID, provider ID, and service account email address from the previous steps.

✅ Style compliance: The changes follow the style guide appropriately.

Recommendation: Please update line 61 to maintain consistency throughout the document.

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