Generic vulnerability reports: Remove extra margin between report columns

What does this MR do?

• removes the whites-pace between report columns on the generic vulnerability report section.
• removes row component

Screenshots (strongly suggested)

before	after	after (wrapping example)

How to test this locally

1. Create a new project, give it a gitlab-ci.yml file with the following contents:

stages:
    - dast

dast:
  stage: dast 
  image: alpine:3.10.2
  script:
    - pwd
  artifacts:
    reports:
      dast: dast.json

1. Download $2098964 and add it to the project file dast.json
2. Run a pipeline, view vulnerabilities

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
  • I have not included a changelog entry because _____.
• 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

Related to #324891 (closed)