Convert all values to string where possible, even if not derived from a table (#18210)

## Addresses #17946
results from querying chrome extension on macOS Chrome browser:
![Screenshot 2024-04-10 at 4 39
13 PM](https://github.com/fleetdm/fleet/assets/61553566/d67901f3-6e20-4190-8dbb-26e93361555b)

- [x] Changes file added for user-visible changes in `changes/`
- [x] Updated tests
- [x] Manual QA for all new/changed functionality
- [ ] TODO - Manual QA on actual Chromebook

---------

Co-authored-by: Jacob Shandling <jacob@fleetdm.com>

changes/17946-fleetd-chrome-numbers

@@ -0,0 +1,2 @@
+- Fix a bug where values not derived from "actual" fleetd-chrome tables were not being displayed
+  correctly (e.g., `SELECT 1` gets its value from the query itself, not a table)

ee/fleetd-chrome/src/db.test.ts

@@ -3,5 +3,5 @@ import VirtualDatabase from "./db";
 test("Simple query", async () => {
   const db = await VirtualDatabase.init();
   const res = await db.query("select 1");
-  expect(res).toEqual({"data": [{ "1": 1 }], "warnings": null});
+  expect(res).toEqual({ data: [{ "1": "1" }], warnings: null });
 });

ee/fleetd-chrome/src/db.ts

@@ -1,7 +1,6 @@
 import SQLiteAsyncESMFactory from "wa-sqlite/dist/wa-sqlite-async.mjs";
 import * as SQLite from "wa-sqlite";
 
-// Alphabetical order
 import Table from "./tables/Table";
 import TableChromeExtensions from "./tables/chrome_extensions";
 import TableDiskInfo from "./tables/disk_info";
@@ -34,7 +33,6 @@ export default class VirtualDatabase {
     this.sqlite3 = sqlite3;
     this.db = db;
 
-    // Alphabetical order
     VirtualDatabase.register(
       sqlite3,
       db,
@@ -81,7 +79,23 @@ export default class VirtualDatabase {
     await this.sqlite3.exec(this.db, sql, (row, columns) => {
       // map each row to object
       rows.push(
-        Object.fromEntries(columns.map((_, i) => [columns[i], row[i]]))
+        Object.fromEntries(
+          columns.map((_, i) => {
+            let [colName, val] = [columns[i], row[i]];
+            if (typeof val !== "string") {
+              if (val.toString) {
+                val = val.toString();
+              } else {
+                this.warnings.push({
+                  column: colName,
+                  error_message: `Value is not a string and doesn't have a toString method: ${val}`,
+                });
+                val = null;
+              }
+            }
+            return [colName, val];
+          })
+        )
       );
     });
     return { data: rows, warnings: this.warnings };