* remove resetCrossSigning flag, which is no longer in use
* drop unnecessary check for cross-signing
The only place where verifyUser is called already checks that cross-signing is
set up. (The function name is also incorrect, since it checks for the
cross-signing key, and not for 4S.)
* avoid calling accessSecretStorage to set up cross-signing or 4S
Send the user to the Encryption settings tab instead
* only create secret storage when specifically asked to
* deprecate using accessSecretStorage to create new 4S
* also remove the obsolete snapshot
* add tests
* Tweak comment
Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
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Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>