* feat(config): add experimental exitCodeForErrors option
* feat(config): give unknown-error its own exit code
* docs: restore exit codes 1 and 2 to the table
* refactor(onboarding): return repository result from ensureOnboarding
Rename ensureOnboardingPr to ensureOnboarding and have it return a new
'onboarding' RepositoryResult. renovateRepository now branches on
repoIsOnboarded, so exactly one of ensureOnboarding/updateRepo produces
the repository result and the non-null assertion on the update result
(TODO #22198) is no longer needed. updateRepo/update no longer return
undefined for non-onboarded repositories.
* refactor(onboarding): keep ensureOnboardingPr name
As a way to make it more predictable what the possible states the
`result` in a given `Repository finished` log message can be, we can
wrap these into a type.
This requires a slight refactor where these are used to make sure that
Typescript is happy with the value being returned.
We can capture the common groups of errors (which are then present as a
`RepositoryResult`) and expose that to be used.
As noticed while working on changes in #39793, we were missing a couple
of repository results that will lead to a repository being treated as
disabled.
RahulGautamSingh