Feat: Restore the button's background color #3221 (#9307)

### What problem does this PR solve?

Feat: Restore the button's background color #3221
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/dataset/setting/advanced-setting-form.tsx

@@ -148,12 +148,7 @@ export default function AdvancedSettingForm() {
             </FormItem>
           )}
         />
-        <Button
-          variant={'tertiary'}
-          size={'sm'}
-          type="submit"
-          className="w-2/5"
-        >
+        <Button size={'sm'} type="submit" className="w-2/5">
           Test
         </Button>
       </form>

web/src/pages/dataset/setting/chunk-method-card.tsx

@@ -93,7 +93,7 @@ export default function ChunkMethodCard() {
   const form = useFormContext();
 
   return (
-    <Card className="border-0 p-6 mb-8 bg-colors-background-inverse-weak flex">
+    <Card className="border-0 p-6 mb-8 flex">
       <div className="w-2/5">
         <FormField
           control={form.control}
@@ -103,7 +103,7 @@ export default function ChunkMethodCard() {
               <FormLabel>{t('chunkMethod')}</FormLabel>
               <Select onValueChange={field.onChange} defaultValue={field.value}>
                 <FormControl>
-                  <SelectTrigger className="bg-colors-background-inverse-weak">
+                  <SelectTrigger>
                     <SelectValue placeholder="Select a verified email to display" />
                   </SelectTrigger>
                 </FormControl>

web/src/pages/dataset/testing/testing-form.tsx

@@ -98,10 +98,7 @@ export default function TestingForm({
             <FormItem>
               <FormLabel>{t('knowledgeDetails.testText')}</FormLabel>
               <FormControl>
-                <Textarea
-                  {...field}
-                  className="bg-colors-background-inverse-weak"
-                ></Textarea>
+                <Textarea {...field}></Textarea>
               </FormControl>
 
               <FormMessage />