stacks: check providers blocks in components during validatation #34707
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This PR explicitly checks the diagnostics produced by the
CheckProvider
function added in the last PR (#34705) as part of the stacks validate functionality. This means we get error messages if there are missing or undeclared providers in theproviders
block for components.I've also added two additional test cases that are currently skipped during tests that describe assigning providers with the same underlying types but different local names (or the reverse in the error case). This isn't currently support but probably should be. I've expanded a TODO calling this out. I'll revisit this in a future PR.