Add logs between fuchsia test steps. (flutter#17584)

* Add logs between fuchsia test steps.

Adding logs and date time in between steps will simplify finding the
steps that are failing during the fuchsia tests.

flutter/flutter#54253

* Use date command instead of DATE..

* Remove extra log line.

* Same spacer lenght for all the log lines.

Author: godofredoc

testing/fuchsia/run_tests.sh

@@ -36,14 +36,19 @@ reboot() {
 
 trap reboot EXIT
 
+echo "$(date) START:PAVING ------------------------------------------"
 ./fuchsia_ctl -d $device_name pave  -i $1
+echo "$(date) END:PAVING --------------------------------------------"
 
+echo "$(date) START:WAIT_DEVICE_READY -------------------------------"
 for i in {1..10}; do
   ./fuchsia_ctl -d $device_name ssh -c "echo up" && break || sleep 15;
 done
+echo "$(date) END:WAIT_DEVICE_READY ---------------------------------"
 
 # TODO(gw280): Enable tests using JIT runner
 
+echo "$(date) START:flutter_runner_tests ----------------------------"
 ./fuchsia_ctl -d $device_name test \
     -f flutter_aot_runner-0.far    \
     -f flutter_runner_tests-0.far  \
@@ -58,23 +63,26 @@ done
 
 # TODO(https://github.com/flutter/flutter/issues/50032) Enable after the
 # Fuchsia message loop migration is complete.
+echo "$(date) START:fml_tests ---------------------------------------"
 ./fuchsia_ctl -d $device_name test \
     -f fml_tests-0.far  \
     -t fml_tests \
     -a "--gtest_filter=-MessageLoop*:Message*:FileTest*"
 
+echo "$(date) START:flow_tests --------------------------------------"
 ./fuchsia_ctl -d $device_name test \
     -f flow_tests-0.far  \
     -t flow_tests
 
+echo "$(date) START:runtime_tests -----------------------------------"
 ./fuchsia_ctl -d $device_name test \
     -f runtime_tests-0.far  \
     -t runtime_tests
 
 # TODO(https://github.com/flutter/flutter/issues/53399): Re-enable
 # OnServiceProtocolGetSkSLsWorks once it passes on Fuchsia.
+echo "$(date) START:shell_tests -------------------------------------"
 ./fuchsia_ctl -d $device_name test \
     -f shell_tests-0.far  \
     -t shell_tests \
     -a "--gtest_filter=-ShellTest.CacheSkSLWorks:ShellTest.SetResourceCacheSize*:ShellTest.OnServiceProtocolGetSkSLsWorks"
-