Separate app mod tests into new test module

This MR separates the tests of gwdatafind_server.app into their own test module.

changed milestone to %GWDataFind Server 1.2.0

added gwdatafind_server.app label

requested review from @duncan.meacher

assigned to @duncan.meacher

added 3 commits

• e41d0fc6...bfeacd6c - 2 commits from branch computing/gwdatafind:master
• f4f69e6e - tests: separate app tests into new test mod

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approved this merge request

mentioned in commit 9071e9e3

merged