test: use fs.watch for the async leak fixture - #11099

Changed pages include:

• index.html - view
• 404.html - view
• blog.html - view
• config/index.html - view
• guide/index.html - view
• releases.html - view
• team.html - view
• todo.html - view
• api/assert-type.html - view
• api/assert.html - view

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