perf: #3457818 Optimize CacheContextsManager:::convertTokensToKeys()/optimizeTokens()

catchrequested to merge
issue/drupal-3457818:3457818-11x into 11.x

By: kristiaanvandeneynde By: berdir By: tibezh By: klausi By: longwave By: catch (cherry picked from commit 8bf67fbd)

Closes #3457818

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