feat: add missing repos to transifex.yml

[shadinaif]

feat: add missing repos to transifex.yml

I forgot to add them in the original PRs
ecommerce: #2181
edx-enterprise: #2179
edx-platform: #1275

Refs:
This pull request is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.
see details here

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[shadinaif]

please review @OmarIthawi , @brian-smith-tcril

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