[Ubuntu] Disable man-db auto update

[subir0071]

Description

New tool, Bug fixing, or Improvement? Please include a summary of the change and which issue is fixed. Also include relevant motivation and context. Disable auto-update of man-db

Every invocation to apt-get update updates the man-db database of the runner image which increases workload execution time.

Hence, this PR would disable the auto-update of man-db for Ubuntu images.

Please follow below links for the image-generation pipeline execution results with this change :

Ubuntu20.04 Ubuntu22.04 Ubuntu24.04

Related issue:

https://github.com/actions/runner-images/issues/10977

Check list

• [X] Related issue / work item is attached
• [ ] Tests are written (if applicable)
• [ ] Documentation is updated (if applicable)
• [X] Changes are tested and related VM images are successfully generated