[1.8.x] Refs #24836 -- Reverted "Simplified the lazy CSRF token implementation...

[1.8.x] Refs #24836 -- Reverted "Simplified the lazy CSRF token implementation in csrf context processor."

This reverts commit 8099d33b as it caused
a regression that cannot be solved without changing force_text() which has
a small risk of introducing regressions. This change will remain in master
along with an update to force_text().