[TTS] update German NGC models trained on Thorsten Datasets

[XuesongYang]

What does this PR do ?

• deprecated the first german single-speaker fastpitch+hifigan model that hacked GermanCharTokenizer by manually mixing graphemes and phonemes. This model was trained on Thorsten's neutral 21.02 dataset.
• added two new fastpitch+hifigan models that applied the refined GermanCharsTokenizer that only uses grapheme-only tokens. These two models were trained on Thorsten's neutral 21.02 and 22.10 (newly released by Thorsten), respectively.

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