Make test file result names unique
- Also, remove dead code that I found during investigation
Fixes#8978
## PR Context
Making the filenames unique, ensures that we can download the results from the artifacts and do our own processing of the results.
This removes some of the last mentions of the AppVeyor name. Don't change the title, we don't want the word to appear in the CLs
Also problem: the last references are in the changelogs but I don't want to modify them without committee approval.
## PR Context
it was removed, #8686
Split Windows CI into the following Jobs
1. Combine Build and xUnit, which published build artifact
1. Elevated CI tests
1. Unelevated CI test
1. Elevated everything else tests
1. Unelevated everything else tests
1. Package build and test
1. Verify xUnit result
## PR Context
Before this test:
- A CI run would take ~14 minutes
- A Feature run would take ~30 minutes
After this change, it always runs all tests and takes ~20 minutes.
Job `Unelevated everything else tests` is the long poll, taking ~4 minutes longer than the next shortest job. We should be able to get this back down to ~15 if we split that test job somehow.
Remove references to uninitialized variable
regressed in #8822
## PR Context
Some artifacts never got published because the conditions would never be true
Refactors `travis.ps1`. Important for maintainers: I removed the webhook and badge stuff as neither exist anymore. I also merged the build and test phase with the bootstrap phase.
