Add Library button to Member Guidelines block in Space settings

[SimoneZaza]

Description

As a Space admin, I want to be able to select member guidelines from the library when I am editing the member guidelines

Acceptance criteria

• [ ] Add Library button in Member Guidelines block, preferrable only visible when block is expanded
• [ ] Library dialog with all Member Guidelines Templates that is opened when user clicks on the button, same as in Space Settings > Templates > library button on any of the blocks
• [ ] Preview dialog from #5931 when user clicks on one of the cards, with button for "USE", same as in Space Settings > Templates > library button on any of the blocks

Additional Context

Areas that will be affected

To be added during the refinement