chore: remove outdated and no-longer valid code comments

[dario-piotrowicz]

Removing outdated code comments in the app-router test files, for reference see the conversation here: opennextjs/opennextjs-cloudflare#406

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Latest commit: d140332

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	24.13%	2009 / 8325
🔵	Statements	24.13%	2009 / 8325
🔵	Functions	51.8%	115 / 222
🔵	Branches	71.16%	501 / 704

File Coverage

No changed files found.

Generated in workflow #1004 for commit d140332 by the Vitest Coverage Report Action

[dario-piotrowicz]

Thanks @conico974 😄