Only init game if we're running tests that need it

[alef]

Summary

Infrastructure "Only init game if we're running tests that need it"

Purpose of change

Implement the long-staning TODO in tests/test_main.cpp with the same name.

Describe the solution

The idea is to tag those few TEST_CASE()s with the special [nogame] tag. This is checked before running the tests by looping over all the selected tests. If all have [nogame], then the global game object is not called.
This speeds up some kind of tests a lot by not initializing the game.

Describe alternatives you've considered

Use a tag [g] to do the opposite. But this would have required to review all the 1139 tests.

Testing

• ✅ [utility] do not initialized the game object
• ✅ other tags do initialize the game object

Additional context

More tests should be reviewed and tagged as [nogame].

[andrei8l]

This broke CI for mods. CI runs the test binary with all mods loaded but no tests selected (~*) and this makes it not load any data.