source-zendesk-support-native: add streams that exist in the imported connector

[jonwihl]

We should make source-zendesk-support-native on par stream-wise with the imported source-zendesk-support. Then we can mark the imported connector as deprecated & encourage users choose the native connector.

Remaining streams that need added include:

• schedules
• sla_policies
• custom_roles
• group_memberships
• ticket_forms
• posts
• organizations
• post_comments
• post_comment_votes
• post_votes

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Addressed by #2407