Ensure that exec errors write exit codes to the DB

In local Podman, the frontend interprets the error and exit code
given by the Exec API to determine the appropriate exit code to
set for Podman itself; special cases like a missing executable
receive special exit codes.

Exec for the remote API, however, has to do this inside Libpod
itself, as Libpod will be directly queried (via the Inspect API
for exec sessions) to get the exit code. This was done correctly
when the exec session started properly, but we did not properly
handle cases where the OCI runtime fails before the exec session
can properly start. Making two error returns that would otherwise
not set exit code actually do so should resolve the issue.

Fixes #6893

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

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