Use a different request stack in Symfony

Closes #2613044

added 9 commits

• 944709e3...09e44ad0 - 7 commits from branch project:11.x
• 80af946e - Use a different request stack in Symfony
• e3e23fa9 - Need to pop even later

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added 1 commit

• f536ceae - Look we're fixing bugs!!!!

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added 3 commits

• a31fa34b - Move test coverage to DrupalKernelTest
• 3cfd337d - Test side-effects
• 1b525028 - Docs

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