PageCache getCacheId doesn't compare cid of the following subrequests in subrequest queue calls.

Problem/Motivation

First requests to the httpKernel will cache request properly but the following requests handled by the same httpKernel instance will return the same response that was cached for the first request.

Proposed resolution

Add check for the comparison of cached cid and current cid in the getCacheId() method of the Drupal\page_cache\StackMiddleware\PageCache class.

Remaining tasks

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User interface changes

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API changes

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Data model changes

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Release notes snippet

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