all: tie timestamp based forks to the passage of London #27279
Merged
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Certain parts of the code can get weird if some later forks are enabled (Shanghai) before earlier ones (Berlin). This can happen if the chain is full syncing but not yet done, yet we request a pending block.
This PR ties all timestamp based forks to London so that you can only ever enter Shanghai and later if London already passed. This should ensure that we cannot end up in a strange future fork whilst still processing historical blocks.