Better sync mode warnings

[eysi09]

I'm getting the following warnings when deploying in sync mode:

I think this needs improving:

• Do we need to print a warning for "Using mode sync for Build postgres" and the rest? It's not clear what that means or why it should be a warning. In any case it'll be very noisy, in particular for large projects.
• There's a typo in bythe
• What does "Ignoring request" mean here? Note that these Deploy actions don't use this.mode in case that's relevant.
• We should skip the new line, it doesn't look pretty when rendered like this, in particular when you have multiple warnings in a row.

To repro, deploy the platform project in sync mode.

[eysi09]

(I originally assigned @stefreak which is probably not the right process. So removing the assignment until we triage :))