test(web-app): add e2e fetch process

It tests the normal request case of timeserie

web-app/src/components/ChartComponent.vue

@@ -1,16 +1,10 @@
 <!-- src/components/ChartComponent.vue -->
 <template>
-  <div class="chart-wrapper">
-    <div v-if="manager.loading" class="loading-state">Loading data...</div>
-    <div v-else-if="manager.error" class="error-state">{{ manager.error }}</div>
-    <div v-else class="chart-container">
-      <Scatter
-        v-if="chartData.datasets.length > 0"
-        :data="chartData"
-        :options="chartOptions"
-      />
-      <div v-else class="no-data-state">No data to display</div>
-    </div>
+  <div v-if="chartData.datasets.length > 0" class="chart-wrapper">
+    <Scatter data-cy="main-chart" :data="chartData" :options="chartOptions" />
+  </div>
+  <div v-else class="no-data-state" data-cy="no-data-display">
+    No data to display
   </div>
   <br />
 </template>

web-app/src/components/ControlPanel.vue

@@ -1,10 +1,14 @@
 <template>
   <div class="control-panel">
-    <button @click="newMeasurments" class="action-button">
+    <button @click="newMeasurments" class="action-button" data-cy="new-measurements-button">
         New Measurments
     </button>
 
-    <button @click="fetchData" class="refresh-button">
+    <button
+        @click="fetchData"
+        class="refresh-button"
+        data-cy="fetch-measurements-button"
+        >
         Fetch Measurments
     </button>
   </div>
@@ -12,6 +16,7 @@
   <div>
       <span>
         <multiselect
+        data-cy="user-mulitselect"
         id="user-select"
         v-model="manager.selected_user"
         :options="manager.user_options"
@@ -24,6 +29,7 @@
       </span>
       <span>
         <multiselect
+        data-cy="room-mulitselect"
         id="room-select"
         v-model="manager.selected_room"
         :options="manager.room_options"
@@ -36,6 +42,7 @@
       </span>
       <span>
         <multiselect
+        data-cy="device-mulitselect"
         id="device-select"
         v-model="manager.selected_device"
         :options="manager.device_options"