Simplify StatusCode compilation failure test

Recently I've seen the test test_StatusCodeFail fail in the gitlab-ci jobs because it triggers a recompilation of GaudiKernel. In principle it should not happen as GaudiKernel should be already available, OTOH there is no need to build it to just try to compile one source file.

This MR changes the test so that it only compile the source file instead of trying to build the executable.

I also split the test in 4 sub-tests, as at some point I had problems with Clang not showing all errors.

See #177

changed milestone to %v36r0

added lhcb-gaudi-head label

approved this merge request

• [2021-04-21 00:06] Validation started with lhcb-gaudi-head#2908
• [2021-04-21 01:12] Validation started with lhcb-run2-gaudi-head#116
• [2021-04-22 00:03] Validation started with lhcb-gaudi-head#2909
• [2021-04-22 01:11] Validation started with lhcb-gaudi-head#2909

mentioned in commit 903647ab

merged

mentioned in merge request !1211 (merged)

changed milestone to %v35r4