fix loading of hyb ctc rnnt bpe models when using from pretrained

[nithinraok]

What does this PR do ?

Fixes issue when loading hybrid rnnt ctc models with .from_pretrained() method

Collection: ASR

Changelog

• Adds list_available_models() method, to skip initializing the models with prompt based hybrid class

Usage

import nemo.collections.asr as nemo_asr
model = nemo_asr.models.ASRModel.from_pretrained("stt_en_fastconformer_hybrid_large_streaming_80ms")

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[github-actions]

[🤖]: Hi @nithinraok 👋,

We wanted to let you know that a CICD pipeline for this PR just finished successfully.

So it might be time to merge this PR or get some approvals.

//cc @chtruong814 @ko3n1g @pablo-garay @thomasdhc