Include Postgres cache option

[JaredMSFT]

Include Postgres cache option in samples documentation.

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Learn Build status updates of commit 756ab96:

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[ShannonLeavitt]

Closing/reopening for fresh validation

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Learn Build status updates of commit 756ab96:

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[Copilot]

Pull request overview

Updates the token cache serialization documentation to include PostgreSQL as an IDistributedCache-backed option alongside existing SQL Server, Redis, and Cosmos DB examples.

Changes:

• Adds Postgres distributed cache configuration snippets (AddDistributedPostgresCache) and notes the required NuGet package.
• Updates the distributed-cache narrative to explicitly list Postgres as an option.
• Minor wording tweak around the SQL Server cache comment.

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PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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Learn Build status updates of commit 7c9c210:

✅ Validation status: passed

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[ShannonLeavitt]

@cilwerner - Could you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge. Before merge is possible, the validation failure will need to be addressed.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team