Fix deadlock in initialization of CoreBTypes using Lazy container #19298
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Replaces #19297 and fixes #19293
The deadlocks are now fixed by introduction of
PostProcessorFrontendAccess.Lazy[T]
container for which initialization is synchronized with the frontend Context, while providing a thread-safe access lacking in original solution.It now also audits where the unrestricted access to context was used and replaces these usages with safer access.
Reverts #19292