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bats/helpers: Add create_forwarding_script

This is one of the functions listed #186 as a candidate for migration
from `tests/template.bats`. I realized it would be helpful to have this
function while migrating the assertions from `tests/scripts/serve.bats`
in mbland/custom-links per #181.

This commit contains two additional changes:

It removes the `--in-process` option from `stub_program_in_path`. It
turns out I wasn't using that option anywhere, and I couldn't make any
tests fail because it didn't have an effect anyway, since the `run`
function from Bats always launches its arguments in a new subshell.

`restore_program_in_path` now strips `BATS_TEST_BINDIR` from the
beginning of `PATH`.

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