Escaped markdown in issue title should not be interpreted as shortcuts

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Summary

• Escaped markdown in issue title should not be interpreted as shortcuts
• Related to #16827 (closed)

Steps to reproduce

Write @testset in a issue title

What is the current bug behavior?

It creates a shortcut to TestseT user

What is the expected correct behavior?

It should just display @testset

Results of GitLab environment info

• Using gitlab.com.
• /help page show 14.8.0-pre 6c159033