feat(pages-shared): add custom response header when we hit asset preservation cache

[M-Krilano]

Adds the x-cf-pgs-apc response header for the pages asset-server handler if the ASSET_PRESERVATION_CACHE_V2 was hit. This allows for easier troubleshooting for cache invalidation issues.

Fixes #7295 .

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---

wrangler@3.88.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20241106.0
workerd	1.20241106.1	1.20241106.1
workerd --version	1.20241106.1	2024-11-06

Please ensure constraints are pinned, and miniflare/workerd minor versions match.