nixos/nextcloud: refactor tests

The tests had very much duplication and some if it was even wrong! For
instance, `withRcloneEnv` in the MySQL test didn't have the `"$@"` at
the bottom to execute commands passed to it. Because of that, the MySQL
testcase never checked whether files can be uploaded.

Since tests are just another module-system I decided to abstract away
common things by using it:

* Define a base module with
  * an empty `client` node and a `nextcloud` node with defaults
    shared among all tests.
  * rclone scripts that are used by all tests.
  * a `testScript` checking upload/download. Additional checks can be
    added via `test-helpers.extraTests`.

* Make common information such as admin user & password shared via
  options.

Also, changed the following things:

* The `name` of the final derivation also includes the Nextcloud major
  it was tested against.

* Improved the objecstore test by making sure the file was actually
  uploaded into the bucket.

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