Generate correct value for defaultWorkerPath in worker.config when AOT publishing is enabled

[kshyju]

resolves #1053

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
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[jviau]

See comment for using $(TargetName)$(TargetExt)

[kshyju]

See comment for using $(TargetName)$(TargetExt)

Yea. Switched to the variable in the latest iteration. Thank you!

[jviau]

I won't block this PR on this, but I think the best approach would be to do something like:

    <PropertyGroup>
      <_FunctionsTarget>dotnet $(TargetName)$(TargetExt)</_FunctionsTarget>
      <_FunctionsTarget Condition="('$(SelfContained)' == 'true' OR '$(PublishAot)' == 'true') AND '%(Identity)' == '$(AppHostIntermediatePath)'">%(None.Link)</_FunctionsTarget>
    </PropertyGroup>

With that, we can then consolidate all of the different ways to produce worker.config with just a single replacement via _FunctionsTarget

[jviau]

Approving this if it works for your use case. I will re-create this behavior in the SDK refactor PR to keep this scenario working (as the changes there will be beyond a simple merge).