radeonsi/tests: clarify the output when results changes

Print up to 10 results that are different from the baseline:

   2 new results:
     * spec@!opengl 1.0@rasterpos,Crash
     * spec@glsl-es-3.00@execution@built-in-functions@vs-packhalf2x16,Fail

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29612>

src/gallium/drivers/radeonsi/ci/radeonsi-run-tests.py

@@ -304,9 +304,20 @@ def run_cmd(args, verbosity):
 
 def verify_results(results):
     with open(results) as file:
-        if len(file.readlines()) == 0:
+        lines = file.readlines()
+        if len(lines) == 0:
             return True
-    print_red("New results (fails or pass). Check {}".format(results))
+        print("{} new result{}:".format(len(lines), 's' if len(lines) > 1 else ''))
+        for i in range(min(10, len(lines))):
+            print("  * ", end='')
+            if "Pass" in lines[i]:
+                print_green(lines[i][:-1])
+            else:
+                print_red(lines[i][:-1])
+        if len(lines) > 10:
+            print_yellow("...")
+        print("Full results: {}".format(results))
+
     return False