Add quiz clearing and deletion functionality with UI enhancements

This commit introduces the ability to clear quiz results and delete quizzes directly from the backoffice. It includes new routes, controllers, modals for user confirmation, and updates to translations. The `QuizRepository` now supports dedicated methods for clearing results and deleting quizzes along with error handling. Related database migrations and front-end adjustments are also included.

translations/messages+intl-icu.nl.xliff

@@ -49,6 +49,10 @@
         <source>Candidates</source>
         <target>Kandidaten</target>
       </trans-unit>
+      <trans-unit id="FNY513f" resname="Clear quiz...">
+        <source>Clear quiz...</source>
+        <target>Test leegmaken...</target>
+      </trans-unit>
       <trans-unit id="sFpB4C2" resname="Correct Answers">
         <source>Correct Answers</source>
         <target>Goede antwoorden</target>
@@ -77,6 +81,10 @@
         <source>Deactivate Quiz</source>
         <target>Deactiveer test</target>
       </trans-unit>
+      <trans-unit id="p9GNNI3" resname="Delete Quiz...">
+        <source>Delete Quiz...</source>
+        <target>Test verwijderen...</target>
+      </trans-unit>
       <trans-unit id="R9yHzHv" resname="Download Template">
         <source>Download Template</source>
         <target>Download sjabloon</target>
@@ -93,6 +101,10 @@
         <source>Enter your name</source>
         <target>Voor je naam in</target>
       </trans-unit>
+      <trans-unit id="HNMwvRn" resname="Error clearing quiz">
+        <source>Error clearing quiz</source>
+        <target>Fout bij leegmaken test</target>
+      </trans-unit>
       <trans-unit id="OGiIhMH" resname="Green">
         <source>Green</source>
         <target>Groen</target>
@@ -177,10 +189,18 @@
         <source>Quiz Added!</source>
         <target>Test toegevoegd!</target>
       </trans-unit>
+      <trans-unit id="vXN8b2w" resname="Quiz cleared">
+        <source>Quiz cleared</source>
+        <target>Test leeggemaakt</target>
+      </trans-unit>
       <trans-unit id="LbVe.2c" resname="Quiz completed">
         <source>Quiz completed</source>
         <target>Test voltooid</target>
       </trans-unit>
+      <trans-unit id="XdfTTMD" resname="Quiz deleted">
+        <source>Quiz deleted</source>
+        <target>Test verwijderd</target>
+      </trans-unit>
       <trans-unit id="frxoIkW" resname="Quiz name">
         <source>Quiz name</source>
         <target>Testnaam</target>
@@ -237,10 +257,6 @@
         <source>Sign in</source>
         <target>Log in</target>
       </trans-unit>
-      <trans-unit id="2QO7aYC" resname="Start Elimination">
-        <source>Start Elimination</source>
-        <target>Start eliminatie</target>
-      </trans-unit>
       <trans-unit id="9m8DOBg" resname="Submit">
         <source>Submit</source>
         <target>Verstuur</target>
@@ -253,10 +269,18 @@
         <source>There are no answers for this question</source>
         <target>Er zijn geen antwoorden voor deze vraag</target>
       </trans-unit>
+      <trans-unit id=".LrcTyU" resname="There is no active quiz">
+        <source>There is no active quiz</source>
+        <target>Er is geen test actief</target>
+      </trans-unit>
       <trans-unit id="Dptvysv" resname="Time">
         <source>Time</source>
         <target>Tijd</target>
       </trans-unit>
+      <trans-unit id="0afY1NF" resname="You have no seasons yet.">
+        <source>You have no seasons yet.</source>
+        <target>Je hebt nog geen seizoenen.</target>
+      </trans-unit>
       <trans-unit id="vVQAP9A" resname="Your Seasons">
         <source>Your Seasons</source>
         <target>Jouw seizoenen</target>