Consolidate these tests into ANGLETest. Add a new parameter to
PlatformParameters that lets us skip normal test setup.

This removes the last 'configless' tests from angle_end2end_tests.

Bug: angleproject:3393
Change-Id: I87186698ade90f95577534eb8ed1dfd4245f740e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1590467
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>