adapter-netlify: Exclude _app/immutable from edge function

[Sylfled]

Describe the problem

Currently, requests to resources under _app/immutable are intercepted by the edge function as every other request is as well. If I understand the situation correctly, this potentially prevents Netlify's caching efforts.

Describe the proposed solution

Requests to _app/immutable could be excluded from the edge function by adding an excludedPattern to the manifest.json under .netlify/edge-functions.

Alternatives considered

No response

Importance

would make my life easier

Additional Information

Different from #11999

[Sylfled]

One downside could be that it would make #3194 impossible.

[Sylfled]

Also related: #10707

[Sylfled]

The edge function already returns without a result for static files.