Use tagged service iterators for page cache request and response policy services

Problem/Motivation

Similar to 📌 Use a tagged service iterator for uninstall validators instead of individual lazy proxies Needs review , the page_cache_request_policy and page_cache_response_policy services (and their counterparts in Dynamic Page Cache module) iterate over a list of services. These could be lazily injected only when needed if we used Symfony tagged iterators.

Steps to reproduce

Proposed resolution

Convert services to use tagged iterators.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet