Added deprecation notes for Neon Deprecation

[Shekar2004]

Description

Neon Postgres service is retiring, hence adding the deprecation note for Neon Postgres package.

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

Adds deprecation messaging to the Neon Postgres Resource Manager library to reflect the service retirement and communicate end-of-maintenance to customers via package metadata and docs.

Changes:

• Added a deprecation notice to the Maven pom.xml package description.
• Added a deprecation notice to the package README.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
sdk/neonpostgres/azure-resourcemanager-neonpostgres/pom.xml	Adds deprecation notice to Maven package metadata (<description>).
sdk/neonpostgres/azure-resourcemanager-neonpostgres/README.md	Adds deprecation notice near the top of the README for visibility.

---

You can also share your feedback on Copilot code review. Take the survey.

[Copilot]

The end-of-maintenance date "12/03/2026" is ambiguous (MM/DD vs DD/MM). Please use an unambiguous format (e.g., "March 12, 2026" or ISO-8601 "2026-03-12") and keep it consistent across docs/metadata.

Suggested change

	Please note, this package has been deprecated and will no longer be maintained after 12/03/2026. Refer to our deprecation policy (https://aka.ms/azsdk/support-policies) for more details.
	Please note, this package has been deprecated and will no longer be maintained after March 12, 2026. Refer to our deprecation policy (https://aka.ms/azsdk/support-policies) for more details.

[Copilot]

The end-of-maintenance date "12/03/2026" is ambiguous (MM/DD vs DD/MM) in the Maven description as well. Please switch to an unambiguous date format and keep it consistent with the README.

Suggested change

<description>Please note, this package has been deprecated and will no longer be maintained after 12/03/2026. Refer to our deprecation policy (https://aka.ms/azsdk/support-policies) for more details. This package contains Microsoft Azure SDK for Neon Postgres Management SDK. For documentation on how to use this package, please see https://aka.ms/azsdk/java/mgmt. Package api-version 2025-03-01.</description>

<description>Please note, this package has been deprecated and will no longer be maintained after 2026-03-12. Refer to our deprecation policy (https://aka.ms/azsdk/support-policies) for more details. This package contains Microsoft Azure SDK for Neon Postgres Management SDK. For documentation on how to use this package, please see https://aka.ms/azsdk/java/mgmt. Package api-version 2025-03-01.</description>

[Copilot]

This PR adds deprecation messaging in README/pom.xml, but sdk/neonpostgres/azure-resourcemanager-neonpostgres/CHANGELOG.md currently has no corresponding deprecation entry under the Unreleased section. Please add the same deprecation note there so the retirement is visible in release notes.