ContestTile onClick handler & optional entire-tile target

[SamusElderg]

See: https://github.com/code4rena-dev/code4rena.com/issues/1182

Lets add an optional onClick handler that overrides any use of an external link (title and such) and also an optional flag to 'apply onclick to whole tile' so that use of any internal-route handler (like useRouter from "next/navigation") is respected clientside