Use explicit boolean true attribute for show-disabled-button

What does this MR do?

• Use explicit boolean true attribute value
• Use kebab-case for attributes, https://docs.gitlab.com/ce/development/fe_guide/style_guide_js.html#naming

<status-icon
  status="failed"
  :show-disabled-button="true" />

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

Why was this MR needed?

• Not following the styleguide

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

Closes #38417 (closed)