New ML yaml + changes to allow for Spectral Codec training with text context

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[Copilot]

Pull Request Overview

This PR introduces changes to support Spectral Codec training with text context in the Magpie-TTS model. The changes include modifications to codec model loading to disable loss modules during inference and variable reorganization to handle different codebook configurations.

• Codec model loading enhancement to disable SCL loss during inference for memory optimization
• Variable restructuring to distinguish between data and model codebook configurations
• New multilingual configuration file for Magpie-TTS with text conditioning support

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
nemo/collections/tts/models/magpietts.py	Modified codec loading logic and reorganized codebook variables to support different training scenarios
examples/tts/conf/magpietts/magpietts_multilingual_v2_lhotse.yaml	Added new configuration file for multilingual Magpie-TTS with text conditioning

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