Mark cloud context internal

[rajkumar-rangaraj]

Fix Issue # .

Changes

(Please provide a brief description of the changes here.)

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed

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[Copilot]

Pull request overview

This PR marks the CloudContext class and the TelemetryContext.Cloud property as internal, representing a breaking change in the public API. The change removes public access to Cloud.RoleName and Cloud.RoleInstance properties, aligning with the 3.x architectural shift towards OpenTelemetry where these values should be set via resource attributes.

Changes:

• Changed CloudContext class visibility from public to internal
• Changed TelemetryContext.Cloud property visibility from public to internal and relocated it after public properties
• Removed CloudContext and related APIs from the public API surface in PublicAPI.Unshipped.txt

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
CloudContext.cs	Changed class visibility modifier from public sealed to internal sealed
TelemetryContext.cs	Changed Cloud property from public to internal and moved it after public properties to maintain organizational consistency
PublicAPI.Unshipped.txt	Removed CloudContext class and TelemetryContext.Cloud property from the public API surface

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