Handle missing users for Terraform State

What does this MR do?

Our Terraform state vue was built with the assumption user data would always be present in GraphQl.

Currently, vue will sometimes error because it is calling .name on null. After testing, it appears some Terraform states will not include user information.

This MR will:

• Update the vue table to handle missing lockUser and versionUser information
• Update associated tests

Screenshots (strongly suggested)

Before (with bug)

After

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
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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