Adds required runtime for code sign tool

[awentzel]

Pull Request

📖 Description

Adds code sign runtime requirements as currently stated "​​Please note the ESRP ADO task requires .NetCore 2.1.n to be installed in your pipeline. This can be installed alongside other versions of the .NetCore."

🎫 Issues

Fixes issue

It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.1.0' (x64) was not found.
  - The following frameworks were found:
      6.0.0-rc.2.21480.5 at [C:\hostedtoolcache\windows\dotnet\shared\Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have modified an existing component

⏭ Next Steps