Add MSBuild integration for kiota generate

[bkoelman]

What started as an attempt to fix incidental build failures in the IDE due to locked files (introduced in #1667) ultimately ended up in taking ideas from https://github.com/kimbell/Kiota.Testing and adding support for <KiotaReference> elements, defined in the JsonApiDotNetCore.OpenApi.Client.Kiota NuGet package.

This PR retries to save when a file is locked and tweaks the command-line parameters used in running kiota.

It also hardens the kiota-patch-generated-code.ps1 script to produce the same output when run multiple times (which shouldn't happen because IDE-based builds are disabled due to terrible responsiveness -- running multiple external processes on every keystroke surprisingly turned out to be a bad idea 😄).

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.41%. Comparing base (d9aa8d0) to head (e6a728e).
Report is 1 commits behind head on openapi.

Additional details and impacted files

@@             Coverage Diff              @@
##           openapi    #1670       +/-   ##
============================================
+ Coverage         0   90.41%   +90.41%     
============================================
  Files            0      458      +458     
  Lines            0    13984    +13984     
  Branches         0     2177     +2177     
============================================
+ Hits             0    12643    +12643     
- Misses           0      910      +910     
- Partials         0      431      +431     

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