[NEW] Import SAML language and auto join SAML channels #14203
Merged
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This closes #14191, closes #14195, closes #14196, and closes #14199.
This PR consists of PRs #14195, #14196 and #14199. Merge conflicts resolved.
Summary: Fixes an exception thrown on SAML login, adds support for 'language' SAML parameter to set the interface language of a new SAML user, and adds support for 'channels' SAML parameter to add a new SAML user to a list of channels.