feat(admin-center): implement admin center settings retrieval and enhance holiday population logic

- Added a new API endpoint in AdminCenterController to fetch admin center settings, including organization details.
- Updated the admin center API router to include the new settings route.
- Enhanced the holiday controller to check for recent holiday population before attempting to repopulate, preventing duplicate entries.
- Improved the holiday calendar component to manage holiday population attempts and display loading states.
- Updated localization files to support new messages related to calculation methods and holiday settings.

worklenz-frontend/src/features/admin-center/admin-center.slice.ts

@@ -83,6 +83,14 @@ export const fetchOrganizationDetails = createAsyncThunk(
   }
 );
 
+export const fetchAdminCenterSettings = createAsyncThunk(
+  'adminCenter/fetchAdminCenterSettings',
+  async () => {
+    const res = await adminCenterApiService.getAdminCenterSettings();
+    return res.body;
+  }
+);
+
 export const fetchOrganizationAdmins = createAsyncThunk(
   'adminCenter/fetchOrganizationAdmins',
   async () => {
@@ -207,6 +215,17 @@ const adminCenterSlice = createSlice({
       state.loadingOrganization = false;
     });
 
+    builder.addCase(fetchAdminCenterSettings.pending, (state, action) => {
+      state.loadingOrganization = true;
+    });
+    builder.addCase(fetchAdminCenterSettings.fulfilled, (state, action) => {
+      state.organization = action.payload;
+      state.loadingOrganization = false;
+    });
+    builder.addCase(fetchAdminCenterSettings.rejected, (state, action) => {
+      state.loadingOrganization = false;
+    });
+
     builder.addCase(fetchOrganizationAdmins.pending, (state, action) => {
       state.loadingOrganizationAdmins = true;
     });