Improve legibility of Gitlab CI (#33482)

Use --backtrace in ci instead of --debug to reduce verbosity
and don't show log on error, since log is already printed

lib/spack/spack/ci.py

@@ -2118,8 +2118,9 @@ def run_standalone_tests(**kwargs):
 
     test_args = [
         "spack",
-        "-d",
-        "-v",
+        "--color=always",
+        "--backtrace",
+        "--verbose",
         "test",
         "run",
     ]

lib/spack/spack/cmd/ci.py

@@ -25,7 +25,7 @@
 section = "build"
 level = "long"
 
-CI_REBUILD_INSTALL_BASE_ARGS = ["spack", "-d", "-v"]
+CI_REBUILD_INSTALL_BASE_ARGS = ["spack", "--color=always", "--backtrace", "--verbose"]
 INSTALL_FAIL_CODE = 1
 
 
@@ -518,7 +518,6 @@ def ci_rebuild(args):
     install_args.extend(
         [
             "install",
-            "--show-log-on-error",  # Print full log on fails
             "--keep-stage",
             "--use-buildcache",
             "dependencies:only,package:never",