clean commit with EMTTS text embedding disabling and pronunciation co… (#15717)

* clean commit with EMTTS text embedding disabling and pronunciation control changes

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* fix code formatting issue

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* comments and backward compatibility for CI/CD tests

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* refactor and docstrings

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* comments about model configs

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* reformat black

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

* legacy model fixes

Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>

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Signed-off-by: Paarth Neekhara <paarth.n@gmail.com>