Thread contexts through some GC functions (#728)

## Description

Will be used later and just generally useful if we ever add tracing or
such to these functions.

## Type of change

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

## Issue(s)
<!-- Can reference multiple issues. Use one of the following "magic words" - "closes, fixes" to auto-close the Github issue. -->

#456 

## Test Plan

<!-- How will this be tested prior to merging.-->

- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E

src/internal/connector/exchange/iterators_test.go

@@ -1,6 +1,7 @@
 package exchange
 
 import (
+	"context"
 	"testing"
 
 	absser "github.com/microsoft/kiota-abstractions-go/serialization"
@@ -75,6 +76,7 @@ func loadService(t *testing.T) *exchangeService {
 // functions are valid for current versioning of msgraph-go-sdk
 func (suite *ExchangeIteratorSuite) TestIterativeFunctions() {
 	var (
+		ctx                     = context.Background()
 		t                       = suite.T()
 		mailScope, contactScope selectors.ExchangeScope
 		userID                  = tester.M365UserID(t)
@@ -141,6 +143,7 @@ func (suite *ExchangeIteratorSuite) TestIterativeFunctions() {
 			// callbackFunc iterates through all models.Messageable and fills exchange.Collection.jobs[]
 			// with corresponding item IDs. New collections are created for each directory
 			callbackFunc := test.iterativeFunction(
+				ctx,
 				userID,
 				test.scope,
 				errs, false,

src/internal/connector/exchange/service_iterators.go

@@ -1,6 +1,7 @@
 package exchange
 
 import (
+	"context"
 	"fmt"
 
 	"github.com/microsoftgraph/msgraph-sdk-go/models"
@@ -29,6 +30,7 @@ type displayable interface {
 // GraphIterateFuncs are iterate functions to be used with the M365 iterators (e.g. msgraphgocore.NewPageIterator)
 // @returns a callback func that works with msgraphgocore.PageIterator.Iterate function
 type GraphIterateFunc func(
+	ctx context.Context,
 	user string,
 	scope selectors.ExchangeScope,
 	errs error,
@@ -43,6 +45,7 @@ type GraphIterateFunc func(
 // objects belonging to any folder are
 // placed into a Collection based on the parent folder
 func IterateSelectAllDescendablesForCollections(
+	ctx context.Context,
 	user string,
 	scope selectors.ExchangeScope,
 	errs error,
@@ -108,6 +111,7 @@ func IterateSelectAllDescendablesForCollections(
 // and storing events in collections based on
 // the calendarID which originates from M365.
 func IterateSelectAllEventsForCollections(
+	ctx context.Context,
 	user string,
 	scope selectors.ExchangeScope,
 	errs error,
@@ -191,6 +195,7 @@ func IterateSelectAllEventsForCollections(
 // that places exchange mail message ids belonging to specific directories
 // into a Collection. Messages outside of those directories are omitted.
 func IterateAndFilterMessagesForCollections(
+	ctx context.Context,
 	user string,
 	scope selectors.ExchangeScope,
 	errs error,
@@ -204,6 +209,7 @@ func IterateAndFilterMessagesForCollections(
 	return func(messageItem any) bool {
 		if !isFilterSet {
 			err := CollectMailFolders(
+				ctx,
 				scope,
 				user,
 				collections,
@@ -237,6 +243,7 @@ func IterateAndFilterMessagesForCollections(
 }
 
 func IterateFilterFolderDirectoriesForCollections(
+	ctx context.Context,
 	user string,
 	scope selectors.ExchangeScope,
 	errs error,

src/internal/connector/exchange/service_query.go

@@ -1,6 +1,7 @@
 package exchange
 
 import (
+	"context"
 	"fmt"
 
 	absser "github.com/microsoft/kiota-abstractions-go/serialization"
@@ -124,6 +125,7 @@ func RetrieveMessageDataForUser(gs graph.Service, user, m365ID string) (absser.P
 }
 
 func CollectMailFolders(
+	ctx context.Context,
 	scope selectors.ExchangeScope,
 	user string,
 	collections map[string]*Collection,
@@ -155,6 +157,7 @@ func CollectMailFolders(
 	}
 
 	callbackFunc := IterateFilterFolderDirectoriesForCollections(
+		ctx,
 		user,
 		scope,
 		err,

src/internal/connector/graph_connector.go

@@ -350,7 +350,7 @@ func (gc *GraphConnector) createCollections(
 		// callbackFunc iterates through all M365 object target and fills exchange.Collection.jobs[]
 		// with corresponding item M365IDs. New collections are created for each directory.
 		// Each directory used the M365 Identifier. The use of ID stops collisions betweens users
-		callbackFunc := gIter(user, scope, errs, gc.failFast, gc.credentials, collections, gc.statusCh)
+		callbackFunc := gIter(ctx, user, scope, errs, gc.failFast, gc.credentials, collections, gc.statusCh)
 		iterateError := pageIterator.Iterate(callbackFunc)
 
 		if iterateError != nil {