ci: Do not show output of failed tests at the end too (#43449)

This reverts #39643, effectively

For the record, @SomeoneToIgnore found it quite cumbersome to scroll
through logs just to see which tests have failed. I kinda see the
argument. At the same time, I wish nextest could do both: it could
aggregate logs of failed tests and then print out the summary.

Release Notes:

- N/A

tooling/xtask/src/tasks/workflows/steps.rs

@@ -53,10 +53,7 @@ pub fn cargo_install_nextest() -> Step<Use> {
 }
 
 pub fn cargo_nextest(platform: Platform) -> Step<Run> {
-    named::run(
-        platform,
-        "cargo nextest run --workspace --no-fail-fast --failure-output immediate-final",
-    )
+    named::run(platform, "cargo nextest run --workspace --no-fail-fast")
 }
 
 pub fn setup_cargo_config(platform: Platform) -> Step<Run> {