Stopped the test runners from reporting an incomplete build as test failures (#709)

The cmake test runners drove Ninja with its default keep-going of 1, so the
first failing target ended the build. Every target scheduled after it was
simply absent, and ctest reports a missing binary as a failing test. A
single link error therefore produced a failure count that moved with build
scheduling order rather than with the code.

Measured on the RISC-V64 regression suite, where two targets genuinely
cannot link:

    before   79 of 95 test binaries built
    after    93 of 95 test binaries built

Fourteen perfectly good binaries were being skipped and counted as
failures. Passing -k 0 lets Ninja finish everything it can; the build still
exits non-zero when a target fails.

Three related problems in the same paths are fixed with it.

A failing configuration used to abort the loop over configurations, so
under set -e the ones after it went unbuilt or untested. The build loops
and the serial test loops now accumulate status and return it at the end,
which is what the parallel test branch already did with wait, and what
cmake_bootstrap.sh already documented for ctest.

Capturing that status removes the set -e protection inside the functions,
so two latent faults become reachable and are closed here. A failed pushd
would have let ctest run in the source tree, where it finds no tests and
reports success; the pushd is now guarded. And ctest's status was
discarded by the popd that follows it, so a configuration with failing
tests returned 0 and was reported as a pass; the status is now carried
past the popd and the summary steps.

Verified on the RISC-V32 suite, which has two genuine failures in each of
its five configurations. Both the serial and the parallel branch now test
all five and exit 8, where the serial branch previously stopped after the
first configuration.

The tx and smp runners are symlinks to scripts/cmake_bootstrap.sh, so they
are covered by the one change there.

Assisted-by: Claude Code (Opus 5) <[email protected]>

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