[dev-tool] Fix build error in full rush update (Azure#23972)

Our dependency `concurrently` updates `ConcurrentlyCommandInput` type to be
better in https://github.com/open-cli-tools/concurrently/pull/374/files#diff-c5f81f4f40df5fad240a4291b8b00ad455a1ede66ba398cb675ff7d9b5e7d051

This PR reacts to it by enforcing correct type of the input `testCommandObj` parameter.

```
src/util/testUtils.ts:54:19 - error TS2345: Argument of type 'Partial<Command>' is not assignable to parameter of type 'ConcurrentlyCommandInput'.
  Type 'Partial<Command>' is not assignable to type '{ command: string; } & Partial<CommandInfo>'.
    Type 'Partial<Command>' is not assignable to type '{ command: string; }'.
      Types of property 'command' are incompatible.
        Type 'string | undefined' is not assignable to type 'string'.
          Type 'undefined' is not assignable to type 'string'.

54     commands.push(testCommandObj);
                     ~~~~~~~~~~~~~~
```

Author: jeremymeng

common/config/rush/pnpm-lock.yaml

@@ -40,7 +40,7 @@
   "private": true,
   "prettier": "../eslint-plugin-azure-sdk/prettier.json",
   "dependencies": {
-    "concurrently": "^7.1.0",
+    "concurrently": "^7.6.0",
     "chalk": "~4.1.1",
     "dotenv": "^8.2.0",
     "fs-extra": "^10.0.0",

common/tools/dev-tool/package.json

@@ -29,7 +29,7 @@ async function shouldRunProxyTool(): Promise<boolean> {
 }
 
 export async function runTestsWithProxyTool(
-  testCommandObj: Partial<ConcurrentlyCommand>
+  testCommandObj: Partial<ConcurrentlyCommand> & { command: string }
 ): Promise<boolean> {
   const commands: ConcurrentlyCommandInput[] = [];
   let concurrentlyOptions: Partial<ConcurrentlyOptions> | undefined;