ESoCC: Show publish draft channel only for users with the feature flag test_dev_feature #5629

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Description

Draft channel versions are built on top of the new ChannelVersion model in Studio. However, currently, there is no way to import specific channel versions on Kolibri, so it makes no sense to offer users the option to publish draft versions if they cannot import them in Kolibri.

Technical details

If the current user does not have the test_dev_feature feature flag set, then:

• We should not render the KRadioButtonGroup node, and use a regular div instead.
• We should hide both KRadioButton's for all publish modes.
• The nesting marging should be removed

Nothing should change for users who have the test_dev_feature feature flag.