[8.0] Script: track this pointer capture from blocks within lambdas (#82228) #82235
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…c#82228) * Script: track this pointer capture from blocks within lambdas If a lambda contains a block that calls into a user function, the painless compiler was not tracking that the lambda needs to capture the `this` pointer. Scripts that attempted to use a lambda that calls a user function from inside a block would trigger an `illegal_state_exception`: > no 'this' pointer within static method `BlockScope` now forwards `setUsesInstanceMethod` calls to it's parent, which may be a `LambdaScope`. `LambdaScope` will also forward `setUsesInstanceMethod` to it's parent after setting it's own `usesInstanceMethod` flag, propagating `this` pointer capture in the case of nested lambdas. Fixes: elastic#82224
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Backports the following commits to 8.0: