refactor: Add lint rules for no unused vars and unused import (#9940)

src/Routers/ClassesRouter.js

@@ -149,7 +149,7 @@ export class ClassesRouter extends PromiseRouter {
     for (const [key, value] of _.entries(query)) {
       try {
         json[key] = JSON.parse(value);
-      } catch (e) {
+      } catch {
         json[key] = value;
       }
     }

src/Routers/FilesRouter.js

@@ -310,7 +310,7 @@ export class FilesRouter {
       const data = await filesController.getMetadata(filename);
       res.status(200);
       res.json(data);
-    } catch (e) {
+    } catch {
       res.status(200);
       res.json({});
     }

src/Routers/PagesRouter.js

@@ -432,7 +432,7 @@ export class PagesRouter extends PromiseRouter {
     let data;
     try {
       data = await this.readFile(path);
-    } catch (e) {
+    } catch {
       return this.notFound();
     }
 
@@ -474,7 +474,7 @@ export class PagesRouter extends PromiseRouter {
     let data;
     try {
       data = await this.readFile(path);
-    } catch (e) {
+    } catch {
       return this.notFound();
     }
 
@@ -517,7 +517,7 @@ export class PagesRouter extends PromiseRouter {
     try {
       const json = require(path.resolve('./', this.pagesConfig.localizationJsonPath));
       this.jsonParameters = json;
-    } catch (e) {
+    } catch {
       throw errors.jsonFailedFileLoading;
     }
   }