[SourceGen] Fix for duplicate properties generated

[satvu]

Issue describing the changes in this PR

resolves #3203

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional Information

The core part of the change is changing the casing of the case sensitivity of the dictionary that collections binding attribute properties (isRequired and IsRequired are not treated differently).

[Copilot]

Pull Request Overview

This PR addresses an issue where binding properties with default values could create duplicate entries when named arguments differ only in casing. The fix implements case-insensitive key comparison to prevent duplicates.

• Updates multiple Azure Functions Worker Extension packages to newer versions
• Removes CosmosDB extension dependency and adds MCP extension support
• Implements case-insensitive duplicate key detection in attribute property parsing

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/Sdk.Generator.Tests/Sdk.Generator.Tests.csproj	Updates package references to newer versions, removes CosmosDB extension, adds MCP extension
test/Sdk.Generator.Tests/FunctionMetadataProvider/RetryOptionsTests.cs	Removes CosmosDB extension assembly reference from test setup
test/Sdk.Generator.Tests/FunctionMetadataProvider/BindingPropertiesTests.cs	Adds new test to verify no duplicate binding properties are created when default values exist
sdk/Sdk.Generators/FunctionMetadataProviderGenerator/FunctionMetadataProviderGenerator.Parser.cs	Implements case-insensitive duplicate key detection when processing attribute named arguments

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[liliankasem]

recommend undoing package change