This way it's easier to reason about where
useless casts/is checks come from, because
everything is on the same screen.
`USELESS_CAST` disappeared from
`FirPsiJsOldFrontendDiagnosticsTestGenerated.testDynamicCastTarget`
because
`LanguageFeature.EnableDfaWarningsInK2`
is disabled, and previously it only
affected `FirCastOperatorsChecker`, but
not `FirUselessTypeOperationCallChecker`,
which felt like an unintended mistake.
A related issue: KT-50965
Nikolay Lunyak
92d8da621e