Give GitLab CLI and LSP project access to code signing service account

Details

• Point of contact for this request: @stanhu
• If a call is needed, what is the proposed date and time of the call: N/A
• Additional call details (format, type of call): N/A

This is related to #27493 (closed). We need to add the following projects:

• gitlab-org/cli#1143 (closed)
• https://gitlab.com/gitlab-org/editor-extensions/gitlab-lsp