Serverless plugin does not honor explicit Service Name when a .twilio-functions points to a different service

[dorkusprime]

Repro Steps

1. Deploy a Serverless Function under any name with twilio serverless:deploy
2. Change the name value in package.json
3. Deploy again with twilio serverless:deploy
4. Notice that the "Service Name" appears correct while deploying
5. List services with twilio serverless:list
6. Notice that the function was deployed to the old Service

(deploying with an explicit --service-name= parameter produces the same result)

Extra credit:

7. rm .twilio-functions
8. twilio serverless:deploy
9. twilio serverless:list
10. Notice that the function was deployed to the new Service

Expected Result

• Serverless function deploys to the Service sent in the package.json name value or via the --service-name= parameter
• If ignoring that parameter/value, the Serverless Plugin would surface an error or warning
• If ignoring that parameter/value, while deploying the Serverless Plugin UI would show the actual Service name being deployed to

Actual Result

• Serverless functions deploy to the first Service configured, regardless of name sent
• Serverless Plugin does not surface an error or warning
• While deploying the Serverless Plugin UI shows the input Service Name rather than the actual Service name being deployed to

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