`runTransaction()`: `maxAttempts` not honored when `> MAX_RETRY_ATTEMPTS`

#### Issue

A call like:

```js
await db.runTransaction(f, { maxAttempts: DB_TRANSACTION_MAX_ATTEMPTS })
```

is not honoring `maxAttempts` when `maxAttempts > MAX_RETRY_ATTEMPTS` (from `ExponentialBackoff` class).
So, setting `maxAttempts: 20` retries only 10 times (which is the current defined value of `MAX_RETRY_ATTEMPTS`).

What is happening is that `maybeBackoff()`:
https://github.com/googleapis/nodejs-firestore/blob/8118d37bf27b49d5e695bf18a9550a37ecc34ca2/dev/src/transaction.ts#L617

is throwing with just an error message when retries hit `MAX_RETRY_ATTEMPTS`:
https://github.com/googleapis/nodejs-firestore/blob/8118d37bf27b49d5e695bf18a9550a37ecc34ca2/dev/src/backoff.ts#L264

so `isRetryableTransactionError(err)` is NOT getting a `GoogleError` error, thus returning `false` and breaking the loop before `maxAttempts` is reached:
https://github.com/googleapis/nodejs-firestore/blob/8118d37bf27b49d5e695bf18a9550a37ecc34ca2/dev/src/transaction.ts#L623

#### Environment details
(Using on Cloud Run Function, gen2)
- OS: Ubuntu 22.04
- Node.js version: 20
- npm version: 10
- `@google-cloud/firestore` version: 7.10.0

Sorry I can't provide a MRE. It just happens when our Firestore database is under heavy load, it's not something I can reproduce at will.