Explore creating a ViewComponent for page headers with subtext and actions

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The following discussion from !90831 (merged) should be addressed:

• @markrian started a discussion: (+1 comment)

  thought: If this layout pattern was used in more than two places, it might be useful to extract a ViewComponent for it.

  Something like:

  = render MembersHeadingLayout.new do |c|
    = c.heading { _('Group members') }
    = c.subtext { group_member_header_subtext(@group) }
    = c.actions do
      ...

  That's out of scope for this MR though, but I think it's a pattern we should start to lean into more. There's a lot of variation in our various page titles 🙈