Remove (old) unused code for fetching messages (#1168)

## Description

Just code cleanup

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [x] 🐹 Trivial/Minor

## Issue(s)

* #1156

## Test Plan

<!-- How will this be tested prior to merging.-->
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/connector/exchange/service_iterators.go

@@ -28,88 +28,6 @@ type GraphIterateFunc func(
 	resolver graph.ContainerResolver,
 ) func(any) bool
 
-// IterateSelectAllDescendablesForCollection utility function for
-// Iterating through MessagesCollectionResponse or ContactsCollectionResponse,
-// objects belonging to any folder are
-// placed into a Collection based on the parent folder
-func IterateSelectAllDescendablesForCollections(
-	ctx context.Context,
-	qp graph.QueryParams,
-	errUpdater func(string, error),
-	collections map[string]*Collection,
-	statusUpdater support.StatusUpdater,
-	resolver graph.ContainerResolver,
-) func(any) bool {
-	var (
-		isCategorySet  bool
-		collectionType optionIdentifier
-		category       path.CategoryType
-		dirPath        path.Path
-		err            error
-	)
-
-	return func(pageItem any) bool {
-		// Defines the type of collection being created within the function
-		if !isCategorySet {
-			if qp.Scope.IncludesCategory(selectors.ExchangeMail) {
-				collectionType = messages
-				category = path.EmailCategory
-			}
-
-			if qp.Scope.IncludesCategory(selectors.ExchangeContact) {
-				collectionType = contacts
-				category = path.ContactsCategory
-			}
-
-			isCategorySet = true
-		}
-
-		entry, ok := pageItem.(graph.Descendable)
-		if !ok {
-			errUpdater(qp.User, errors.New("Descendable conversion failure"))
-			return true
-		}
-
-		// Saving to messages to list. Indexed by folder
-		directory := *entry.GetParentFolderId()
-
-		if _, ok = collections[directory]; !ok {
-			dirPath, err = getCollectionPath(
-				ctx,
-				qp,
-				resolver,
-				directory,
-				category,
-			)
-			if err != nil {
-				errUpdater(
-					"failure during IterateSelectAllDescendablesForCollections",
-					err,
-				)
-			}
-
-			service, err := createService(qp.Credentials, qp.FailFast)
-			if err != nil {
-				errUpdater(qp.User, err)
-				return true
-			}
-
-			edc := NewCollection(
-				qp.User,
-				dirPath,
-				collectionType,
-				service,
-				statusUpdater,
-			)
-			collections[directory] = &edc
-		}
-
-		collections[directory].AddJob(*entry.GetId())
-
-		return true
-	}
-}
-
 // IterateSelectAllEventsForCollections
 // utility function for iterating through events
 // and storing events in collections based on
@@ -233,99 +151,6 @@ func CollectionsFromResolver(
 	return nil
 }
 
-// IterateAndFilterDescendablesForCollections is a filtering GraphIterateFunc
-// that places exchange objectsids belonging to specific directories
-// into a Collection. Messages outside of those directories are omitted.
-func IterateAndFilterDescendablesForCollections(
-	ctx context.Context,
-	qp graph.QueryParams,
-	errUpdater func(string, error),
-	collections map[string]*Collection,
-	statusUpdater support.StatusUpdater,
-	resolver graph.ContainerResolver,
-) func(any) bool {
-	var (
-		isFilterSet bool
-		cache       map[string]string
-	)
-
-	return func(descendItem any) bool {
-		if !isFilterSet {
-			if resolver != nil {
-				err := CollectionsFromResolver(
-					ctx,
-					qp,
-					resolver,
-					statusUpdater,
-					collections,
-				)
-				if err != nil {
-					errUpdater(qp.User, err)
-					return false
-				}
-			} else {
-				err := CollectFolders(
-					ctx,
-					qp,
-					collections,
-					statusUpdater,
-					resolver,
-				)
-				if err != nil {
-					errUpdater(qp.User, err)
-					return false
-				}
-			}
-
-			// Caches folder directories
-			cache = make(map[string]string, 0)
-			isFilterSet = true
-		}
-
-		message, ok := descendItem.(graph.Descendable)
-		if !ok {
-			errUpdater(qp.User, errors.New("casting messageItem to Descendable"))
-			return true
-		}
-		// Saving only messages for the created directories
-		folderID := *message.GetParentFolderId()
-
-		directory, ok := cache[folderID]
-		if !ok {
-			result := translateIDToDirectory(ctx, qp, resolver, folderID)
-			if result == "" {
-				errUpdater(qp.User,
-					errors.New("getCollectionPath experienced error during translateID"))
-			}
-
-			cache[folderID] = result
-			directory = result
-		}
-
-		if _, ok = collections[directory]; !ok {
-			return true
-		}
-
-		collections[directory].AddJob(*message.GetId())
-
-		return true
-	}
-}
-
-func translateIDToDirectory(
-	ctx context.Context,
-	qp graph.QueryParams,
-	resolver graph.ContainerResolver,
-	directoryID string,
-) string {
-	fullPath, err := getCollectionPath(ctx, qp, resolver, directoryID, path.EmailCategory)
-	if err != nil {
-		return ""
-	}
-
-	return fullPath.Folder()
-}
-
 func getCategoryAndValidation(es selectors.ExchangeScope) (
 	optionIdentifier,
 	path.CategoryType,