chore: improve dfx deploy message.

[vincent-dfinity]

Description

Improve dfx deploy error message to let users know what to do next.

$ dfx deploy
Error: Failed to fetch the root key, did you run 'dfx start' to start the local replica?
An error happened during communication with the replica: error sending request for url (http://127.0.0.1:4943/api/v2/status)

Fixes # (issue)

SDK-1858

How Has This Been Tested?

Added an e2e test.

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.

[marydwyer]

Is information about the rootkey at all relevent to the user? I'm wondering if we could streamline the message even further to something like this:

Error: Failed to deploy because your a replica is not running.
Please run 'dfx start' and try again.

[vincent-dfinity]

Is information about the rootkey at all relevent to the user? I'm wondering if we could streamline the message even further to something like this:

Error: Failed to deploy because your a replica is not running. Please run 'dfx start' and try again.

1. It just indicates where the error comes from.
2. The reason why I use a question did you run 'dfx start' to start the local replica? is I'm not quite sure if it's the only reason to fail fetching the root key. @sesi200 do you know if there're any other cases?