Make AD_EXPECT macros consistent with GTest's EXPECT macros.

[RobinTF]

In Googletest there's macros with the EXPECT_ prefix that will continue to execute a test even after failure. In contrast there's also ASSERT_ macros that will immediately stop the respective test. QLever defines some additional test macros prefixed with AD_EXPECT. So far these sometimes behaved like GTests's EXPECT_ and sometimes like ASSERT_. This commit makes these macros consistently behave like EXPECT_ macros, which is also consistent with their naming.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.43%. Comparing base (f986808) to head (8259873). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1456 +/- ## ========================================== - Coverage 89.44% 89.43% -0.01% ========================================== Files 346 346 Lines 25262 25262 Branches 3371 3371 ========================================== - Hits 22595 22594 -1 + Misses 1507 1505 -2 - Partials 1160 1163 +3 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud