Add developer-mode check to setup:upgrade command

[renttek]

Add a check for application state/mode to setup:upgrade command.

Description

Add a check for application state/mode to setup:upgrade command.
If the mode is "developer" then don't show the di-recompile notice.
If mode is something other than "developer", show the notice.

Fixed Issues (if relevant)

1. magento setup:upgrade prompts to run compilation, even in developer mode #11044: magento setup:upgrade prompts to run compilation, even in developer mode

Manual testing scenarios

1. Set application mode to "developer" (bin/magento deploy:mode:set developer)

2. Run CLI command "setup:upgrade"

3. There should be no notice to re-run di-compile

4. Set application mode to something other than "developer". e.g. "default" (bin/magento deploy:mode:set default)

5. Run CLI command "setup:upgrade"

6. There should be a notice to re-run di-compile

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[dmanners]

I guess this has already been covered by #11050 and #11047 for the develop and develop2.2 branch by @schmengler Interesting that you both picked slightly different boolean checks.