Hide irrelevant panels in Mercurial/Subversion, fix Subversion URIs

Summary:
Ref T10923.

• Hide "Automation", "Staging" and "Branches" in repositories where they do nothing.
• Fix SVN SSH URIs to read "svn+ssh://" and have proper paths.

Test Plan:

• Verified irrelevant sections did not appear in Subversion in Manage UI.
• Checked out a new hosted SVN repository.

Reviewers: chad, avivey

Reviewed By: avivey

Maniphest Tasks: T10923

Differential Revision: https://secure.phabricator.com/D15874