test: allow bootstrap tests to succeed when targeted toolchains already exist #695
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Currently, running tests locally as described in
dev.mdworks at most one time.In subsequent runs, the user's local
elaninstallation already has the test and build toolchains installed.This causes
elan toolchain install leanprover/lean4:x-y-zto fail with the messageThis PR makes the assertion succeed if the
...is already installederror is printed, even if the exit code indicates failure.This allows the test suit to be run multiple times locally.