[MSBUILD SDK] Implicitly reference existing SDK analyzer packages

[jviau]

Issue describing the changes in this PR

Part of #3141

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

Includes the existing analyzers as implicit package references. We will work on directly embedding the analyzers in the SDK later.

[Copilot]

Pull request overview

This PR adds implicit package references for the SDK analyzer and generator packages to the Azure Functions SDK, enabling automatic inclusion of code analyzers and source generators in Azure Functions projects without requiring explicit package references from users.

• Adds two new implicit package references (Analyzers v1.2.2 and Generators v1.3.6) to Azure.Functions.Sdk.props
• Updates integration tests to verify the new implicit package references are properly included

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Azure.Functions.Sdk/Targets/Azure.Functions.Sdk.props	Adds PackageReference elements for Microsoft.Azure.Functions.Worker.Sdk.Analyzers (v1.2.2) and Microsoft.Azure.Functions.Worker.Sdk.Generators (v1.3.6) with IsImplicitlyDefined="true"
test/Azure.Functions.Sdk.Tests/Integration/SdkEndToEndTests.Items.cs	Updates Item_WorkerPackage_IsIncluded test to verify all three implicit package references (Worker, Analyzers, and Generators) and removes version-specific assertion for Worker package

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