Rollup merge of #145982 - Zalathar:logv, r=jieyouxu

compiletest: Reduce the number of `println!` calls that don't have access to `TestCx`

In order to stop using `#![feature(internal_output_capture)]` in compiletest, we need to be able to capture the console output of individual tests run by the executor.

The approach I have planned is to have all test runners print “console” output into a trait object that is passed around as part of `TestCx`, since almost all test-runner code has easy access to that context. So `println!("foo")` will become `writeln!(self.stdout, "foo")`, and so on.

In order to make that viable, we need to avoid unnecessary printing in places that don't have easy access to `TestCx`. To do so, we can either get rid of unnecessary print statements, or rearrange the code to make the context available. This PR uses both approaches.

r? jieyouxu

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