[TTS] add CI test for RADTTS training recipe.

[XuesongYang]

Signed-off-by: Xuesong Yang [email protected]

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[lgtm-com]

This pull request introduces 2 alerts when merging c869c2e into d4ce66d - view on LGTM.com

new alerts:

• 2 for Unused import

[borisfom]

I have updated my branch ... a lot, please pick up - or should we merge mine first ?

[XuesongYang]

I have updated my branch ... a lot, please pick up - or should we merge mine first ?

This is a draft PR in order to test radtts. Since it is contingent on your fix, do you mind if cherry-pick this one to your PR? I will let you know once I cleaned up this PR. Thanks.

[XuesongYang]

close this PR since #5358 has cherry-picked these changes.