fix(vercel): skip ISR routes in observability routes

[pi0x]

🔗 Linked issue

Follow-up to #4698 (#4447, #4592)

❓ Type of change

• 🐞 Bug fix (a non-breaking change that fixes an issue)

📚 Description

Routes with an ISR rule already skip their observability function, but they were still listed in config.json, pointing to a function that is never created. Since #4698 those entries can't be reached (the ISR route before them always matches first), so this only cleans up the output.

The ISR check moves from the function loop into getObservabilityRoutes, so the functions and the config.json routes come from the same filtered list. Tests are adapted from #4592 by @ShreeBohara.

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Project	Deployment	Actions	Updated
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Reviewing files that changed from the base of the PR and between a136558 and 212b792.

📒 Files selected for processing (2)

• src/presets/vercel/utils.ts
• test/unit/vercel-observability-routes.test.ts

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commit: 212b792