chore: restore test of global APIs based on loading a script tag

[trusktr]

Summary

What kind of change does this PR introduce? (check at least one)

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactor
• [ ] Docs
• [x] Build-related changes
• [ ] Repo settings
• [ ] Other, please describe:

Does this PR introduce a breaking change? (check one)

• [ ] Yes
• [x] No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

Ensures some tests that were in place for https://github.com/docsifyjs/docsify/issues/1057 are still in place after playwright changes, to ensure global APIs load via script tag.

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