Service request timeout is overwritten at call time

Ref: https://github.com/urjitbhatia/nodejs-common/pull/1

1) Is this a client library issue or a product issue?
a library issue

2) Did someone already solve this?
no

3) Do you have a support contract?
no

If the support paths suggested above still do not result in a resolution, please provide the following details.

#### Environment details

- OS: Ubuntu
- Node.js version: 18
- npm version: (Yarn 1.22.4)
- `@google-cloud/common` version: v4.0.3

#### Steps to reproduce

Note: This surfaces while using the google translate client: https://github.com/googleapis/google-cloud-node-core/issues/256

1. Create a translate client.
2. Set a request timeout
3. Point request to a dummy server that takes long or set a really small timeout to test
4. Request continues beyond the timeout and doesn't abort

Thanks!