Fix questions and false negatives

What does this MR do and why?

1. Fix questions that didn't have spaces (ex. What is this?Blah => What is this? Blah)

2. Force reset Issue's variable link_reference_pattern

link_reference_pattern does not reflect the stubbed url (gitlab.com).

Epic does not have this problem because its method does not memoize.

Related to #427251 (closed)

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