0a433fc876d82df1005f175c1254fff62f0f36f8 [validation] Remove unused cacheSigStore from CheckInputsFromMempoolAndCache (John Newbery)
Pull request description:
CheckInputsFromMempoolAndCache() is only called in one place, and
cacheSigStore is set to true in that call site. Remove the argument
entirely.
Also improve commenting.
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Backport of Core PR17242