Add longer group names added in core 30798

[phil-davis]

Core PR owncloud/core#30798 used some different and longer group names in acceptance tests that check sharing autocompletion, because now there is a default minimum for that autocompletion lookup and so existing group and user names for tests need to be a decent length.

We can add those here, and also need to keep the other "grp1"... names that are used elsewhere in other acceptance tests. It should all pass with both sets of test groups existing - CI will know.

[codecov-io]

Codecov Report

Merging #222 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #222   +/-   ##
=========================================
  Coverage     34.61%   34.61%           
  Complexity     1375     1375           
=========================================
  Files            32       32           
  Lines          3975     3975           
=========================================
  Hits           1376     1376           
  Misses         2599     2599

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