Display GPG status on repository and blob pages

What does this MR do?

• Add the GPG status badge to
  • project details page
  • repository page
  • blob page
• Adjust margins of GPG status and CI status
• Increase size of CI status icon
• Replace copy to clipboard button icon

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

Not scope of this merge request:

• https://gitlab.com/gitlab-org/gitlab-ce/issues/49502
• https://gitlab.com/gitlab-org/gitlab-ce/issues/49505
• https://gitlab.com/gitlab-org/gitlab-ce/issues/49507

Screenshots

Before	After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer

What are the relevant issue numbers?

closes https://gitlab.com/gitlab-org/gitlab-ce/issues/36046