Improve `pipeline config` azdo text

This was my experience using `azd pipeline config` today:


As a quick fix, I think we can set a maximum length for messages. I can see how we can shorten the few verbose messages below:

## Message improvements

These serve as both length trimming + improve user-friendliness
1. Instead of "Configuring repository X to use credentials for Y" -> "Configuring service connection"
2. "Would you like to commit and push your changes to start the configured CI pipeline" -> This is way too heavy handed.

Proposed flow:
"Would you like to start the pipeline right now?"
User: Yes / No
"Uncommitted changes detected. Commit them now?"
User: Yes / No
"Pipeline runs either on current changes as-is, or with the committed changes based on selection 2"