Rename QUnit test files from "test_" to "test.js"

Updates QUnit test files from starting with "test_" to ending with
"test.js" in accordance with the Readers Wed coding conventions.

https://www.mediawiki.org/wiki/Reading/Web/Coding_conventions

Bug: T197884
Change-Id: I98877e3fc432b6edd0c53d834ef23b3ef8fb7d6a

includes/MinervaHooks.php

@@ -91,12 +91,12 @@ class MinervaHooks {
 				'resources/skins.minerva.scripts/PageIssuesOverlay.js',
 				'resources/skins.minerva.scripts/pageIssues.js',
 				// test files
-				'tests/qunit/skins.minerva.scripts/test_DownloadIcon.js',
-				'tests/qunit/skins.minerva.scripts/test_pageIssuesParser.js',
-				'tests/qunit/skins.minerva.scripts/test_AB.js',
-				'tests/qunit/skins.minerva.scripts/test_PageIssuesOverlay.js',
-				'tests/qunit/skins.minerva.scripts/test_pageIssues.js',
-				'tests/qunit/skins.minerva.notifications.badge/test_NotificationBadge.js'
+				'tests/qunit/skins.minerva.scripts/DownloadIcon.test.js',
+				'tests/qunit/skins.minerva.scripts/pageIssuesParser.test.js',
+				'tests/qunit/skins.minerva.scripts/AB.test.js',
+				'tests/qunit/skins.minerva.scripts/PageIssuesOverlay.test.js',
+				'tests/qunit/skins.minerva.scripts/pageIssues.test.js',
+				'tests/qunit/skins.minerva.notifications.badge/NotificationBadge.test.js'
 			],
 		];