Fix highlighting bug when the language is not recognized

Chen Charnolevskyrequested to merge
482476-highlight-when-unrecognize-lang into master

What does this MR do and why?

When the code flow viewer displays a file with an unrecognized language, the 'steps' of the flows are also not displayed in the viewer.

MR acceptance checklist

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Screenshots or screen recordings

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Before After
Screenshot_2024-09-02_at_19.43.16 Screenshot_2024-09-02_at_19.42.49

How to set up and validate locally

  1. Upload a GitLab Ultimate license
  2. Clone the code flow project and run his pipeline to display vulnerabilities
  3. Navigate to the project => Secure => Vulnerability report => Select the first vulnerability to navigate to the vulnerability details page
  4. Make sure all the steps in the viewer shows and working well.

Numbered steps to set up and validate the change are strongly suggested.

Related to #482476 (closed)

Edited by Chen Charnolevsky

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