[FIR] Rename DUPLICATE_LABEL_IN_WHEN to DUPLICATE_BRANCH_CONDITION_IN_WHEN

... and fix the message

#KT-35289 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDataClassConverters.kt

@@ -4245,8 +4245,8 @@ internal val KT_DIAGNOSTIC_CONVERTER = KtDiagnosticConverterBuilder.buildConvert
             token,
         )
     }
-    add(FirErrors.DUPLICATE_LABEL_IN_WHEN) { firDiagnostic ->
-        DuplicateLabelInWhenImpl(
+    add(FirErrors.DUPLICATE_BRANCH_CONDITION_IN_WHEN) { firDiagnostic ->
+        DuplicateBranchConditionInWhenImpl(
             firDiagnostic as KtPsiDiagnostic,
             token,
         )

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -2958,8 +2958,8 @@ sealed interface KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         override val diagnosticClass get() = CommaInWhenConditionWithoutArgument::class
     }
 
-    interface DuplicateLabelInWhen : KtFirDiagnostic<KtElement> {
-        override val diagnosticClass get() = DuplicateLabelInWhen::class
+    interface DuplicateBranchConditionInWhen : KtFirDiagnostic<KtElement> {
+        override val diagnosticClass get() = DuplicateBranchConditionInWhen::class
     }
 
     interface ConfusingBranchConditionError : KtFirDiagnostic<PsiElement> {

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -3563,10 +3563,10 @@ internal class CommaInWhenConditionWithoutArgumentImpl(
     token: KtLifetimeToken,
 ) : KtAbstractFirDiagnostic<PsiElement>(firDiagnostic, token), KtFirDiagnostic.CommaInWhenConditionWithoutArgument
 
-internal class DuplicateLabelInWhenImpl(
+internal class DuplicateBranchConditionInWhenImpl(
     firDiagnostic: KtPsiDiagnostic,
     token: KtLifetimeToken,
-) : KtAbstractFirDiagnostic<KtElement>(firDiagnostic, token), KtFirDiagnostic.DuplicateLabelInWhen
+) : KtAbstractFirDiagnostic<KtElement>(firDiagnostic, token), KtFirDiagnostic.DuplicateBranchConditionInWhen
 
 internal class ConfusingBranchConditionErrorImpl(
     firDiagnostic: KtPsiDiagnostic,