Enable uploading of SVG images for Design Management

Merged Luke Duncalfe requested to merge 12771-enable-SVGs-for-design-management into master

What does this MR do?

This MR allows files with .svg extension to be uploaded as designs.

The feature is behind a feature flag, which will be disabled by default. This will allow us to assess the security implications further with the security team.

Issue #12771 (closed).

Does this MR meet the acceptance criteria?

Conformity

Performance and Testing

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

Closes #12771 (closed)

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