Allow output of Rails migrations in reconfigure step

What does this MR do?

!5971 (merged) disabled output of steps in stderr/stdout to avoid leaking passwords. This change also applied to suppressing the output of Rails migrations, which can fail due to a variety of reasons. This made it harder to debug upgrade failures.

gitlab-rake db:migrate should not leak any sensitive information, as it is usually just prints out the status of the migrations and error messages if one fails. This commit re-enables the output to ease debugging.

By default, Chef's bash resource prints out the environment variables upon failure, but the environment may contain sensitive information. Add a custom resource (bash_hide_env) that suppresses the environment output.

Related issues

Relates to #6801 (closed)

Checklist

See Definition of done.

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• Merge Request Title, and Description are up to date, accurate, and descriptive
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Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
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