test: send stdout/stderr of testsuite units to journal & console

to make debugging in CIs slightly easier.

test/test-functions

@@ -2941,6 +2941,18 @@ test_setup() {
             mask_supporting_services
         fi
 
+        # Send stdout/stderr of testsuite-*.service units to both journal and
+        # console to make debugging in CIs easier
+        # Note: we can't use a dropin for `testsuite-.service`, since that also
+        #       overrides 'sub-units' of some tests that already use a specific
+        #       value for Standard(Output|Error)=
+        #       (e.g. test/units/testsuite-66-deviceisolation.service)
+        if ! get_bool "$INTERACTIVE_DEBUG"; then
+            local dropin_dir="${initdir:?}/etc/systemd/system/testsuite-${TESTID:?}.service.d"
+            mkdir -p "$dropin_dir"
+            printf '[Service]\nStandardOutput=journal+console\nStandardError=journal+console' >"$dropin_dir/99-stdout.conf"
+        fi
+
         if get_bool "$hook_defined"; then
             test_append_files "${initdir:?}"
         fi

test/units/testsuite-22.service

@@ -9,5 +9,3 @@ Wants=getty-pre.target
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
 Type=oneshot
-StandardOutput=tty
-StandardError=tty

test/units/testsuite-35.service

@@ -5,6 +5,4 @@ Description=TEST-35-LOGIN
 [Service]
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
-StandardOutput=journal+console
-StandardError=journal+console
 Type=oneshot

test/units/testsuite-45.service

@@ -5,6 +5,4 @@ Description=TEST-45-TIMEDATE
 [Service]
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
-StandardOutput=journal+console
-StandardError=journal+console
 Type=oneshot

test/units/testsuite-64.service

@@ -6,5 +6,3 @@ Description=TEST-64-UDEV
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
 Type=oneshot
-StandardOutput=journal+console
-StandardError=journal+console

test/units/testsuite-71.service

@@ -5,6 +5,4 @@ Description=TEST-71-HOSTNAME
 [Service]
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
-StandardOutput=journal+console
-StandardError=journal+console
 Type=oneshot

test/units/testsuite-73.service

@@ -5,6 +5,4 @@ Description=TEST-73-LOCALE
 [Service]
 ExecStartPre=rm -f /failed /testok
 ExecStart=/usr/lib/systemd/tests/testdata/units/%N.sh
-StandardOutput=journal+console
-StandardError=journal+console
 Type=oneshot