feat(dev): enable colors when running in nextest (#23819)

* feat(dev): enable colors when running in nextest

* Fix and simplify colors

* Remove CI check

* Make test fail

* Set CARGO_TERM_COLOR always in test.yml

* Revert "Make test fail"

This reverts commit bf6acf2.

Author: thomasqueirozb

.github/workflows/test.yml

@@ -15,6 +15,7 @@ env:
   DD_ENV: "ci"
   DD_API_KEY: ${{ secrets.DD_API_KEY }}
   RUST_BACKTRACE: full
+  CARGO_TERM_COLOR: always
   VECTOR_LOG: vector=debug
   VERBOSE: true
   CI: true

src/test_util/mod.rs

@@ -139,6 +139,10 @@ pub fn trace_init() {
     let color = {
         use std::io::IsTerminal;
         std::io::stdout().is_terminal()
+            || std::env::var("NEXTEST")
+                .ok()
+                .and(Some(true))
+                .unwrap_or(false)
     };
     // Windows: ANSI colors are not supported by cmd.exe
     // Color is false for everything except unix.