Revert "Issue #3456556 by pooja_sharma, longwave, quietone: Improve date...

Revert "Issue #3456556 by pooja_sharma, longwave, quietone: Improve date format in status report EOL message"

This reverts commit 18767c6c.

core/modules/update/src/ProjectSecurityRequirement.php

@@ -232,7 +232,7 @@ private function getDateEndRequirement() {
     }
     else {
       $security_coverage_end_timestamp = \DateTime::createFromFormat('Y-m-d', $full_security_coverage_end_date)->getTimestamp();
-      $output_date_format = $date_format === 'Y-m-d' ? 'Y-M-d' : 'F Y';
+      $output_date_format = $date_format === 'Y-m-d' ? 'Y-M-d' : 'Y-M';
       $formatted_end_date = $date_formatter
         ->format($security_coverage_end_timestamp, 'custom', $output_date_format);
       $translation_arguments = ['@date' => $formatted_end_date];

core/modules/update/tests/src/Functional/UpdateSemverCoreSecurityCoverageTest.php

@@ -194,7 +194,7 @@ public static function securityCoverageMessageProvider() {
       'installed_version' => '9.5.0',
       'fixture' => 'sec.9.5.0',
       'requirements_section_heading' => 'Checked',
-      'message' => "Covered until November 2023 $release_coverage_message",
+      'message' => "Covered until 2023-Nov $release_coverage_message",
       'mock_date' => '2023-01-01',
     ];
     // Ensure a warning is displayed if less than six months remain until the
@@ -203,7 +203,7 @@ public static function securityCoverageMessageProvider() {
       'installed_version' => '9.5.0',
       'fixture' => 'sec.9.5.0',
       'requirements_section_heading' => 'Warnings found',
-      'message' => "Covered until November 2023 $update_soon_message $release_coverage_message",
+      'message' => "Covered until 2023-Nov $update_soon_message $release_coverage_message",
       'mock_date' => '2023-05-15',
     ];