[SandboxIR][SandboxVec] Remove score tracking from Region, add RegionWithScore (#190293) Up until now the `Region` class contained a `ScoreBoard` and was tracking instruction costs by default. However, design-wise the Region is a generic IR-level structure and should be independent from score tracking. So this patch removes the score tracking capability from the base `Region` class and creates a separate `RegionWithScore` derived class for that. The new class is placed in the vectorizer directory because the score tracking is meant for the vectorizer. Should be NFC.
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