Added file existence check before override generateFromTypeSpec flag

[raych1]

Fixed the following issue introduced by PR:

[EXT-ERR] Failed to read generateOutput.json. Please check if the generate script is configured correctly.
Error: [EXT-ERR] Failed to read generateOutput.json. Please check if the generate script is configured correctly.
    at generateReport (/mnt/vss/_work/1/s/azure-rest-api-specs/node_modules/@azure-tools/spec-gen-sdk/dist/automation/reportStatus.js:109:19)
    at sdkAutoMain (/mnt/vss/_work/1/s/azure-rest-api-specs/node_modules/@azure-tools/spec-gen-sdk/dist/automation/entrypoint.js:125:43)
    at async generateSdk (/mnt/vss/_work/1/s/azure-rest-api-specs/node_modules/@azure-tools/spec-gen-sdk/dist/cli/cli.js:45:18)
    at async Object.handler (/mnt/vss/_work/1/s/azure-rest-api-specs/node_modules/@azure-tools/spec-gen-sdk/dist/cli/cli.js:178:5)
spec-gen-sdk execution time: 0s

We already have the file existence check after SDK is generated, however, this issue happens when SDK generation configuration isn't enabled which causes the generation step to be skipped. So, we need to check the file existence and cannot throw the exception if the file doesn't exist. Instead, do not override the flag when the file doesn't exist.

Repro pipeline run

[Copilot]

Pull request overview

This PR fixes a file access issue in the .NET SDK generation workflow by adding a file existence check before attempting to read generateOutput.json. Previously, the code would throw an error when the file didn't exist; now it gracefully handles the absence of the file by only processing it when it exists.

• Added fs.existsSync() check before reading generateOutput.json
• Changed error handling from throwing to gracefully continuing when file is absent
• Version bumped from 0.9.5 to 0.9.6

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
tools/spec-gen-sdk/src/automation/reportStatus.ts	Added file existence check in the condition and removed error throwing when file is absent, allowing graceful handling when generation configuration is not enabled for .NET
tools/spec-gen-sdk/package.json	Bumped version to 0.9.6
tools/spec-gen-sdk/package-lock.json	Updated lockfile to reflect new version 0.9.6
tools/spec-gen-sdk/CHANGELOG.md	Added release notes for version 0.9.6 documenting the fix

Files not reviewed (1)

• tools/spec-gen-sdk/package-lock.json: Language not supported