fix(core): root path middleware not applied when setting the global prefix

[CodyTseng]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Issue Number: #11572

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 8835fc59-fe00-45a0-886e-1cbcd9a0dccb

Details

• 3 of 3 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 92.161%

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Totals
Change from base Build 2bf2e4c8-5da9-4dd1-8f93-3b733029afc6:	0.001%
Covered Lines:	6737
Relevant Lines:	7310

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💛 - Coveralls

[kamilmysliwiec]

I created a new PR based off this one with a slightly different approach in order to avoid introducing breaking changes Let's track this here #13337