Cherry-pick PR microsoft#50279 into release-4.8

Component commits:
eff4406 Revert "Fixed an issue with contextual type for intersection properties (microsoft#48668)"
This reverts commit 9236e39.

Author: RyanCavanaugh

src/compiler/checker.ts

@@ -27124,37 +27124,16 @@ namespace ts {
         }
 
         function getTypeOfPropertyOfContextualType(type: Type, name: __String, nameType?: Type) {
-            return mapType(type, (t): Type | undefined => {
-                if (t.flags & TypeFlags.Intersection) {
-                    const intersection = t as IntersectionType;
-                    let newTypes = mapDefined(intersection.types, getTypeOfConcretePropertyOfContextualType);
-                    if (newTypes.length > 0) {
-                        return getIntersectionType(newTypes);
-                    }
-                    newTypes = mapDefined(intersection.types, getTypeOfApplicableIndexInfoOfContextualType);
-                    if (newTypes.length > 0) {
-                        return getIntersectionType(newTypes);
-                    }
-                    return undefined;
-                }
-                const concretePropertyType = getTypeOfConcretePropertyOfContextualType(t);
-                if (concretePropertyType) {
-                    return concretePropertyType;
-                }
-                return getTypeOfApplicableIndexInfoOfContextualType(t);
-            }, /*noReductions*/ true);
-
-            function getTypeOfConcretePropertyOfContextualType(t: Type) {
+            return mapType(type, t => {
                 if (isGenericMappedType(t) && !t.declaration.nameType) {
                     const constraint = getConstraintTypeFromMappedType(t);
                     const constraintOfConstraint = getBaseConstraintOfType(constraint) || constraint;
                     const propertyNameType = nameType || getStringLiteralType(unescapeLeadingUnderscores(name));
                     if (isTypeAssignableTo(propertyNameType, constraintOfConstraint)) {
                         return substituteIndexedMappedType(t, propertyNameType);
                     }
-                    return undefined;
                 }
-                if (t.flags & TypeFlags.StructuredType) {
+                else if (t.flags & TypeFlags.StructuredType) {
                     const prop = getPropertyOfType(t, name);
                     if (prop) {
                         return isCircularMappedProperty(prop) ? undefined : getTypeOfSymbol(prop);
@@ -27165,15 +27144,10 @@ namespace ts {
                             return restType;
                         }
                     }
+                    return findApplicableIndexInfo(getIndexInfosOfStructuredType(t), nameType || getStringLiteralType(unescapeLeadingUnderscores(name)))?.type;
                 }
                 return undefined;
-            }
-            function getTypeOfApplicableIndexInfoOfContextualType(t: Type) {
-                if (!(t.flags & TypeFlags.StructuredType)) {
-                    return undefined;
-                }
-                return findApplicableIndexInfo(getIndexInfosOfStructuredType(t), nameType || getStringLiteralType(unescapeLeadingUnderscores(name)))?.type;
-            }
+            }, /*noReductions*/ true);
         }
 
         // In an object literal contextually typed by a type T, the contextual type of a property assignment is the type of