Fix 20 tests on windows that require runfiles (off by default)

20 tests on Windows require runfiles; mainly because their test wrappers do not include calls to the runfiles BATCH script provided in this repository. Remove the runfiles constraints and update the test wrappers to allow run without runfiles where possible.

Success criteria:
* All tests pass with bazel test //... --noenable_runfiles [windows default]

Start by running `bazel test //... --noenable_runfiles` on Windows and identify the 20 failing tests. Inspect their test wrappers and runfiles constraints, then verify that all tests pass with runfiles disabled as the success criterion requires.

Written by the indexing model from the issue text.