I'd like to implement a 'backstop' strategy, such that it will prevent all other
optimizers from removing tasks under certain conditions (e.g every 10th push).
The nicest way to implement this seems to be an 'All' composite strategy
(similar to 'Either' which this patch renames to 'Any'). This means we could
do something like:
All("seta", "backstop")
which means we would only remove tasks if *all* substrategies say to remove
tasks.
Differential Revision: https://phabricator.services.mozilla.com/D68620
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extra : moz-landing-system : lando
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