CACHE-11939: add request cf overriding cache rules compat flags (#20965)

Co-authored-by: Yawar Jamal <[email protected]>

Author: yj7o5

src/content/compatibility-flags/fetch-api-request-cf-overrides-cache-rules.md

@@ -0,0 +1,14 @@
+---
+_build:
+  publishResources: false
+  render: never
+  list: never
+
+name: "Override cache rules cache settings in `request.cf` object for Fetch API"
+sort_date: "2023-08-01"
+enable_date: "2025-04-02"
+enable_flag: "request_cf_overrides_cache_rules"
+disable_flag: "no_request_cf_overrides_cache_rules"
+---
+
+This flag changes the behavior of cache when requesting assets via the [Fetch API](/workers/runtime-apis/fetch). Cache settings specified in the `request.cf` object, such as `cacheEverything` and `cacheTtl`, are now given precedence over any [Cache Rules](/cache/how-to/cache-rules/) set.