Make filtered search boards more consistent with EE

What does this MR do?

Make filtered search boards consistent with EE version

EE

this.isHandledAsync = true;
this.cantEdit = cantEdit;

https://gitlab.com/gitlab-org/gitlab-ee/blob/master/app/assets/javascripts/boards/filtered_search_boards.js#L13-14

CE

this.isHandledAsync = true;

this.cantEdit = cantEdit;

https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/assets/javascripts/boards/filtered_search_boards.js#L13-15

Are there points in the code the reviewer needs to double check?

None

Why was this MR needed?

Make CE => EE 🤝🏿

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary

• Documentation created/updated

• API support added

• Tests

  • Added for this feature/bug

  • All builds are passing

• Conform by the merge request performance guides

• Conform by the style guides

• Branch has no merge conflicts with master (if it does - rebase it please)

• Squashed related commits together

What are the relevant issue numbers?

Closes #33723 (closed)