Service request timeout is overwritten at call time

[urjitbhatia]

Ref: urjitbhatia#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: googleapis/gax-nodejs#1410

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!