Prevent simultaneous usage of @InjectMock and @InjectSpy on the same bean during build

[BegoMaier]

Description

When a bean is accidentally annotated with both @InjectMock and @InjectSpy, some tests start failing sporadically. This makes test runs flaky and unpredictable because the framework does not clearly handle this conflicting situation.

@QuarkusTest
class AnnotationTest {

    @InjectMock
    @InjectSpy
    TestBean testBean;

    // ... tests here e.g. with mockito.verify
}

Expected Behavior

Fail fast during build or test setup when a single bean is annotated with both @InjectMock and @InjectSpy.

Actual Behavior

Currently, no immediate error is raised, but tests may fail inconsistently at runtime, which makes it hard to diagnose the root cause.

Suggestion

Please add validation logic that prevents the simultaneous use of @InjectMock and @InjectSpy on the same bean. This would avoid hidden, non-deterministic test failures and make the developer experience clearer.