Revert "Merge branch 'ph/diffsVirtualScrollerChanges' into 'master'"

What does this MR do and why?

Revert "Merge branch 'ph/diffsVirtualScrollerChanges' into 'master'"

This reverts merge request !125565 (merged) to resolve the following master broken incidents:

• gitlab-org/quality/engineering-productivity/master-broken-incidents#3000 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3001 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3002 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3003 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3004 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3005 (closed)
• gitlab-org/quality/engineering-productivity/master-broken-incidents#3006 (closed)

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