[FIR] Fixed phase for FirCompanionGenerationProcessor to COMPANION_GENERATION

Phase COMPILER_REQUIRED_ANNOTATIONS causes errors in the kotlinx serialization tests:

org.jetbrains.kotlin.fir.symbols.FirLazyResolveContractViolationException: `lazyResolveToPhase(COMPILER_REQUIRED_ANNOTATIONS)` cannot be called from a transformer with a phase COMPILER_REQUIRED_ANNOTATIONS.
`lazyResolveToPhase` can be called only from a transformer with a phase which is strictly greater than a requested phase;
 i.e., `lazyResolveToPhase(A)` may be only called from a lazy transformer with a phase B, where A < B. This is a contract of lazy resolve

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/plugin/FirCompanionGenerationProcessor.kt

@@ -30,7 +30,7 @@ import org.jetbrains.kotlin.name.SpecialNames.DEFAULT_NAME_FOR_COMPANION_OBJECT
 class FirCompanionGenerationProcessor(
     session: FirSession,
     scopeSession: ScopeSession
-) : FirTransformerBasedResolveProcessor(session, scopeSession, FirResolvePhase.COMPILER_REQUIRED_ANNOTATIONS) {
+) : FirTransformerBasedResolveProcessor(session, scopeSession, FirResolvePhase.COMPANION_GENERATION) {
     override val transformer: FirTransformer<Nothing?> = FirCompanionGenerationTransformer(session)
 }