Fix AOT tests in nightly

[lbussell]

This PR is built off of Accept more types of failures when retrying HTTP requests in tests (#6063) since that change was necessary for more reliable local testing. That's commit 3f88859.

Fixes #6049

Basically, once the test filtering was fixed in 1c0e89d, some AOT tests were failing. Here is a summary of what was happening:

• AOT scenario tests were running on non-AOT images which was failing.
  • This is resolved by filtering test data by variant.
• Self-contained publish scenario tests were running on AOT images which will never work since AOT images don't contain the correct dependencies.
• Console app "AOT" scenario test was failing
  • This is because we were using the console template. For web tests, there is the webapiaot template. There is no equivalent non-web template so we defaulted to the console template. Since the console template does not have AOT-specific MSBuild properties in its project file, this test was failing when it tried to run. It complained there was no .NET installation (duh).
  • I removed the scenario since it was never functional and it needs a re-think.

There should be follow-up work to:

• Enable AOT tests on non-aot images #6066
  • For example, by installing additional packages on the SDK images. This will require additional test Dockerfile refactoring.
• Add an AOT console app test #6067
  • There are probably multiple approaches to this - a checked-in project file, a string based project file, passing the requisite MSBuild properties via command line, etc.

After review/merge, I'll file issues for the above two scenarios.

[mthalman]

Note that I have a pending comment on #6063 which this PR depends on.

[lbussell]

Note that I have a pending comment on #6063 which this PR depends on.

Removed the duplicate commit with a rebase.

[lbussell]

Filed the two follow-up issues: #6066 and #6067