refactor: update @nestjs/common imports to reference top level index.ts

[caucik]

PR Checklist

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• 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)
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PR Type

What kind of change does this PR introduce?

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

What is the current behavior?

No new behavior.

Issue Number: N/A

What is the new behavior?

No new behavior.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

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