Remove the workaround introduced in previous PR for format decorator

[ArcturusZhang]

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[archerzz]

just double confirm: from now on, we'll not support @format decorator values like uri which already have corresponding types defined, right?

[ArcturusZhang]

just double confirm: from now on, we'll not support @format decorator values like uri which already have corresponding types defined, right?

yes, and supported formats are supported in TCGC, we just take whatever types TCGC gives us