fix: correct no-store and no-cache behavior for response cache

[carodewig]

Confusingly, no-store and no-cache have different meanings. Per RFC 9111:

• no-store: allows serving response from cache, but prohibits storing response in cache
• no-cache: prohibits serving response from cache, but allows storing response in cache
  (NB: no-cache actually prohibits serving response from cache without revalidation - but the router doesn't distinguish between lookup and revalidation)

The response caching plugin was incorrectly treating no-store as both 'no serving response from the cache' and 'no storing response in the cache.'

This PR fixes that behavior.

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[apollo-librarian]

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* graphos/routing/(latest)/configuration/envvars.mdx

Build ID: 12e7c00917907d23adc8425d
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URL: https://www.apollographql.com/docs/deploy-preview/12e7c00917907d23adc8425d

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