[trivial] Qt: Add testnet chainsize constants and switch for intro #13229
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Fixes #13213.
The current GUI intro screen (datadir picker) requires 202 GB free disk space for testnet due to not being able to switch between test/mainnet.
This adds size constants for testnet (20GB chain size [It's actually not even 15GB, but keep some room] and 1GB chain state size which is pretty accurate).