Disabled related items expand button when no items

Florie Guibertrequested to merge
370793-the-expand-button-within-the-linked-items-widget-should-be-disabled-if-no-items-have-been into master

What does this MR do and why?

Disables toggle button in related items block on issue page when there are no related items.

Screenshots or screen recordings

Before After
CleanShot_2022-08-15_at_14.58.45 Fugiat_animi_non_eligendi_rerum_voluptatem_dolorum_sequi_porro.___27____Issues___Gitlab_Org___Gitlab_Shell___GitLab

How to set up and validate locally

Validate that an issue without relationship has the block not toggable.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #370793 (closed)

Edited by Florie Guibert

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