Enable console message show if running EE or FOSS

What does this MR do?

Allow the console information to show whether we're running EE or FOSS.

Screenshots

> FOSS_ONLY=1 spring rails c
--------------------------------------------------------------------------------
 GitLab:       12.7.0-pre (da42f9fc5cb) FOSS
 GitLab Shell: 10.3.0
 PostgreSQL:   10.10
--------------------------------------------------------------------------------

> spring rails c
--------------------------------------------------------------------------------
 GitLab:       12.7.0-pre (fd0cb7d7b78) EE
 GitLab Shell: 10.3.0
 PostgreSQL:   10.10
--------------------------------------------------------------------------------

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team