MM-29620 Add props to post input to prevent autofill (#4916)

* MM-29620 Add props to post input to prevent autofill

* Set autoCompleteType to off instead of none

app/components/post_draft/__snapshots__/post_draft.test.js.snap

@@ -291,6 +291,7 @@ exports[`PostDraft Should render the DraftInput 1`] = `
       <View>
         <TextInput
           allowFontScaling={true}
+          autoCompleteType="off"
           blurOnSubmit={false}
           disableFullscreenUI={true}
           keyboardAppearance="light"
@@ -316,6 +317,7 @@ exports[`PostDraft Should render the DraftInput 1`] = `
             }
           }
           testID="post_input"
+          textContentType="none"
           underlineColorAndroid="transparent"
         />
         <View

app/components/post_draft/post_input/__snapshots__/post_input.test.js.snap

@@ -2,6 +2,7 @@
 
 exports[`PostInput should match, full snapshot 1`] = `
 <ForwardRef(WrappedPasteableTextInput)
+  autoCompleteType="off"
   blurOnSubmit={false}
   disableFullscreenUI={true}
   keyboardAppearance="light"
@@ -24,6 +25,7 @@ exports[`PostInput should match, full snapshot 1`] = `
       "paddingTop": 6,
     }
   }
+  textContentType="none"
   underlineColorAndroid="transparent"
 />
 `;

app/components/post_draft/post_input/post_input.js

@@ -290,6 +290,8 @@ export default class PostInput extends PureComponent {
                 keyboardType={this.state.keyboardType}
                 onEndEditing={this.handleEndEditing}
                 disableFullscreenUI={true}
+                textContentType='none'
+                autoCompleteType='off'
                 keyboardAppearance={getKeyboardAppearanceFromTheme(theme)}
             />
         );