improvement(routerlicious-driver): change Object.keys to Object.entries (microsoft#23710)

Prepare for enabling no-unchecked-record-access /
noUncheckedIndexedAccess in routerlicious-driver by switching
Object.keys to Object.entries. Full type safety will require additional
changes in a future PR.

Author: RishhiB

packages/drivers/routerlicious-driver/src/createNewUtils.ts

@@ -12,10 +12,7 @@ import { ISummaryTree, SummaryType } from "@fluidframework/driver-definitions";
  * @returns Modified summary tree where the blob contents could be utf8 string only.
  */
 export function convertSummaryToCreateNewSummary(summary: ISummaryTree): ISummaryTree {
-	const keys = Object.keys(summary.tree);
-	for (const key of keys) {
-		const summaryObject = summary.tree[key];
-
+	for (const [key, summaryObject] of Object.entries(summary.tree)) {
 		switch (summaryObject.type) {
 			case SummaryType.Tree: {
 				summary.tree[key] = convertSummaryToCreateNewSummary(summaryObject);

packages/drivers/routerlicious-driver/src/summaryTreeUploadManager.ts

@@ -41,8 +41,7 @@ export class SummaryTreeUploadManager implements ISummaryUploadManager {
 		previousFullSnapshot: ISnapshotTreeEx | undefined,
 	): Promise<string> {
 		const entries = await Promise.all(
-			Object.keys(summaryTree.tree).map(async (key) => {
-				const entry = summaryTree.tree[key];
+			Object.entries(summaryTree.tree).map(async ([key, entry]) => {
 				const pathHandle = await this.writeSummaryTreeObject(entry, previousFullSnapshot);
 				const treeEntry: IGitCreateTreeEntry = {
 					mode: getGitMode(entry),