Remove container-image: from location on the Dependency List

What does this MR do and why?

This MR removes container-image: prefix from dependency location on the Dependency List when dependencies were found in container image (using container-scanning analyzer).

Screenshots or screen recordings

Before

After

How to set up and validate locally

1. Create new project.
2. Configure Container-Scanning in .gitlab-ci.yml file:

variables:
    DOCKER_IMAGE: alpine:3.12.0

include:
    - template: Security/Container-Scanning.gitlab-ci.yml

1. Run the pipeline
2. Go to Security & Compliance -> Dependency list
3. Take a look at the location field.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #349002 (closed)