Fix uninitialized constant Hashdiff (NameError)

Ashvin Sharmarequested to merge
ashvins/538163/hotfix-no-require-hashdiff into master

What does this MR do and why?

Fix uninitialized constant Hashdiff (NameError)

Sentry link: https://new-sentry.gitlab.net/organizations/gitlab/issues/1719766/events/e7ea4173ac8145bfb1d72400325f0313/?project=3

This is the first time Hashdiff is used in a non-test code. As a result it was not loaded by Rails previously.

References

Sentry link: https://new-sentry.gitlab.net/organizations/gitlab/issues/1719766/events/e7ea4173ac8145bfb1d72400325f0313/?project=3

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