minor #25752 Don't right trim the deprecation message (alexpott)

This PR was submitted for the 3.4 branch but it was squashed and merged into the 3.3 branch instead (closes #25752).

Discussion
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Don't right trim the deprecation message

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | maybe yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!--highly recommended for new features-->

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The PhpUnit bridge lists deprecation messages after a test. In order to do this it outputs the message but it right trims the message - removing any fullstops. This is unexpected. It does this to add the number of time the message appears but this is not really necessary because the number of the times a deprecation message is triggered and from where is added below.

Commits
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0b03631 Don't right trim the deprecation message

Author: nicolas-grekas

DeprecationErrorHandler.php

@@ -134,7 +134,7 @@ public static function register($mode = false)
                         uasort($deprecations[$group], $cmp);
 
                         foreach ($deprecations[$group] as $msg => $notices) {
-                            echo "\n", rtrim($msg, '.'), ': ', $notices['count'], "x\n";
+                            echo "\n  ", $notices['count'], 'x: ', $msg, "\n";
 
                             arsort($notices);
 

Tests/DeprecationErrorHandler/default.phpt

@@ -63,20 +63,20 @@ $foo->testNonLegacyBar();
 --EXPECTF--
 Unsilenced deprecation notices (3)
 
-unsilenced foo deprecation: 2x
+  2x: unsilenced foo deprecation
     2x in FooTestCase::testLegacyFoo
 
-unsilenced bar deprecation: 1x
+  1x: unsilenced bar deprecation
     1x in FooTestCase::testNonLegacyBar
 
 Remaining deprecation notices (1)
 
-silenced bar deprecation: 1x
+  1x: silenced bar deprecation
     1x in FooTestCase::testNonLegacyBar
 
 Legacy deprecation notices (1)
 
 Other deprecation notices (1)
 
-root deprecation: 1x
+  1x: root deprecation