"Re-running failed tests in verbose mode" does not use host runner

[tiran]

Bug report

Issue GH-84461 / PR GH-91930 introduces a new test runner API to execute tests with a different Python interpreter. It is used by WebAssembly and other cross-compile targets to run tests. The test controll process uses the native build Python interpreter while the tests workers use the cross compiled host Python interpreter with a HOSTRUNNER like wasmtime or NodeJS.

The rerun_failed_tests() method does not use ns.python. Failed tests are re-executed with the build Python instead of host Python.

@ethanhs

[emmatyping]

It seems that rerunning failed tests does not use processes at all unfortunately :/

I think the test rerunning code could be modified to use the multiprocess test executor with some effort.