run: Avoid execve() when measuring test coverage

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Normally, we want to save a process and get better signal handling
by replacing the `flatpak run` process with bubblewrap.

However, when we're doing profiling or measuring coverage, we want to
exit cleanly so that profiling data can be recorded, which is done in
an atexit() hook. In this situation, bypass the execve() optimization;
instead, start bubblewrap in the background, immediately wait for it,
and propagate its exit status.

Signed-off-by: Simon McVittie <smcv@collabora.com>

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