Update README and ExecutionTimeReportPrinter for improved test output formatting

- Changed code block syntax in README to `text` for better readability.
- Enhanced the display format of slowest tests in README to include a timer icon.
- Adjusted spacing in the `ExecutionTimeReportPrinter` for consistent output formatting.

Author: floriankraemer

README.md

@@ -57,12 +57,12 @@ After running your tests, you'll see a summary report at the end showing the slo
 - **Red**: Tests that exceed the danger threshold (default: 5 seconds)
 - **Normal**: Tests below the warning threshold
 
-```
+```text
 Top 10 slowest tests:
 
-  1. MyTest::testSlowOperation                    : 1234.56 ms (1.235 s)  [colored red]
-  2. AnotherTest::testComplexCalculation          :  987.65 ms (0.988 s)  [colored yellow]
-  3. DatabaseTest::testLargeQuery                  :  654.32 ms (0.654 s)  [colored yellow]
+  1. ⏱ 1234.56 ms (1.235 s) MyTest::testSlowOperation                    [colored red]
+  2. ⏱  987.65 ms (0.988 s) AnotherTest::testComplexCalculation          [colored yellow]
+  3. ⏱  654.32 ms (0.654 s) DatabaseTest::testLargeQuery                 [colored yellow]
   ...
 ```
 

src/ExecutionTimingExtension/ExecutionTimeReportPrinter.php

@@ -45,8 +45,6 @@ public function print(): void
 
         $this->printHeader(count($topTests));
         $this->printTestLines($topTests);
-
-        echo PHP_EOL;
     }
 
     private function shouldPrint(): bool
@@ -142,7 +140,7 @@ private function printTestLine(array $test, int $rank, array $columnWidths): voi
         $timeSecDisplay = $color !== '' ? Color::colorize($color, $timeSecFormatted) : $timeSecFormatted;
 
         printf(
-            "  %s. ⏱ %s %s %s" . PHP_EOL,
+            "  %s. ⏱  %s %s %s" . PHP_EOL,
             $rankFormatted,
             $timeMsDisplay,
             $timeSecDisplay,