Hide form inputs for group member without editing rights

What does this MR do?

While viewing Members list of any group, if viewer doesn't have editing rights (eg; change member role or expiration date of membership) he/she should not see form inputs (which are currently disabled), instead he should see role and expiration date as labels, this MR does that.

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

Only file modified in this MR is _member.html.haml, in which the member.expires_at.to_time.in_time_zone.to_s(:medium) retrieves date and time of expiration of membership, but it doesn't retrieve Timezone in GMT, should we alter this method call (with strftime may be) to include Timezone?

Why was this MR needed?

See issue #24861 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• 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 #24861 (closed)