feat(sdk): emit AZFW0110 warning when FunctionsEnableWorkerIndexing is set

[jviau]

Summary

Closes #3395.

Adds a new AZFW0110 SDK warning that is emitted when the FunctionsEnableWorkerIndexing property is set in a project using the new Azure.Functions.Sdk. Worker indexing is always enabled with this SDK, so the property no longer has any effect — the warning announces its deprecation and tells the user to remove it.

Changes

Warning implementation (follows the existing AZFW01xx diagnostic pattern):

• Strings.resx — added the AZFW0110_Warning_FunctionsEnableWorkerIndexingDeprecated message.
• LogMessage.cs — added the Warning_FunctionsEnableWorkerIndexingDeprecated field and wired it into FromId.
• Targets/Azure.Functions.Sdk.targets — emit the warning via FuncSdkLog in _ValidateFunctionsVersion when '$(FunctionsEnableWorkerIndexing)' != ''. The SDK never sets this property itself, so a non-empty value means the user set it.

Docs:

• docs/sdk-rules/AZFW0110.md — new rule page (cause, description, how-to-fix, suppression guidance).
• docs/sdk-rules/index.md — added the AZFW0110 row.
• src/Azure.Functions.Sdk/README.md — migration note that the property is deprecated.
• release_notes.md — feat entry.

Test:

• SdkEndToEndTests.Build.cs — Build_FunctionsEnableWorkerIndexing_Deprecated_Warning, following the existing Build_NoRestoreHook_Warning pattern.

Testing

• SDK builds clean (0 warnings/errors), confirming the generated Strings.AZFW0110_... resource resolves.
• LogMessageTests — 62/62 pass. These reflection-driven tests automatically assert the new resource string and LogMessage field are correctly wired.

Note: The integration test suite could not be executed locally because the long worktree directory name pushes the SDK resolver's generated paths past Windows' 260-char MAX_PATH limit during restore. This was confirmed to be environmental — the pre-existing Build_Success test fails identically. The added test follows the established, passing pattern and should run in CI.

[Copilot]

Pull request overview

This PR adds a new SDK diagnostic (AZFW0110) to warn users that FunctionsEnableWorkerIndexing is deprecated and has no effect when using Azure.Functions.Sdk, and updates documentation and integration tests accordingly.

Changes:

• Introduces AZFW0110 warning text + LogMessage wiring for the new diagnostic.
• Emits the warning from MSBuild targets when FunctionsEnableWorkerIndexing is set.
• Adds rule documentation and an end-to-end integration test validating the warning behavior.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/Azure.Functions.Sdk.Tests/Integration/SdkEndToEndTests.Build.cs	Adds an integration test asserting AZFW0110 is emitted when the deprecated property is set.
src/Azure.Functions.Sdk/Targets/Azure.Functions.Sdk.targets	Emits AZFW0110 via FuncSdkLog during validation when FunctionsEnableWorkerIndexing is non-empty.
src/Azure.Functions.Sdk/Strings.resx	Adds the AZFW0110 warning message resource string.
src/Azure.Functions.Sdk/release_notes.md	Notes the new AZFW0110 warning in release notes.
src/Azure.Functions.Sdk/README.md	Adds a migration note pointing users to AZFW0110 and advising removal of the property.
src/Azure.Functions.Sdk/LogMessage.cs	Adds Warning_FunctionsEnableWorkerIndexingDeprecated and maps it in FromId.
docs/sdk-rules/index.md	Adds AZFW0110 to the SDK rules index table.
docs/sdk-rules/AZFW0110.md	Adds a new rule documentation page describing cause, impact, and fix.

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