App Config Spring - Json content type fix

[mrm9084]

Description

Fixes a bug where ';' wasn't checked when checking for json content type. Results in our chat completion type not working.

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

Fixes JSON Content-Type detection to correctly handle media type parameters (e.g., ; charset=utf-8), restoring expected behavior for chat completions.

Changes:

• Strip Content-Type parameters before evaluating JSON media types.
• Improve structured-suffix (+json) matching to be case-insensitive and whitespace-tolerant.
• Expand unit test coverage for parameters, casing, whitespace, and edge cases.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
sdk/spring/spring-cloud-azure-appconfiguration-config/src/main/java/com/azure/spring/cloud/appconfiguration/config/implementation/JsonConfigurationParser.java	Strips ; parameters and improves subtype parsing for JSON detection.
sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/JsonConfigurationParserTest.java	Adds broad test coverage for Content-Type variants (parameters/whitespace/case/edge cases).
sdk/spring/spring-cloud-azure-appconfiguration-config/CHANGELOG.md	Documents the bug fix in the changelog.

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[Copilot]

Pull request overview

Fixes JSON Content-Type detection in spring-cloud-azure-appconfiguration-config so values containing parameters (e.g., application/json; charset=utf-8) and structured syntax suffixes are correctly recognized as JSON, preventing JSON settings from being skipped.

Changes:

• Strip ; parameters before evaluating the media type and improve subtype parsing to check the structured syntax suffix after the last +.
• Expand unit test coverage for isJsonContentType, including parameterized content types and additional edge cases.
• Document the bug fix in the module CHANGELOG.

Reviewed changes

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

File	Description
sdk/spring/spring-cloud-azure-appconfiguration-config/src/main/java/com/azure/spring/cloud/appconfiguration/config/implementation/JsonConfigurationParser.java	Fixes JSON content-type detection by stripping parameters and checking +json suffix correctly.
sdk/spring/spring-cloud-azure-appconfiguration-config/src/test/java/com/azure/spring/cloud/appconfiguration/config/implementation/JsonConfigurationParserTest.java	Adds additional isJsonContentType test coverage for parameters, casing, whitespace, and edge cases.
sdk/spring/spring-cloud-azure-appconfiguration-config/CHANGELOG.md	Notes the JSON content-type parameter handling bug fix in the Unreleased section.

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