docs: resolve #8118 by updating contributing guidelines

[Mallikarjunadevops]

Fixes #8118

Description

This pull request adds documentation updates that directly address the community feature request.

• Moved the Linting instructions strictly before the Build Your Changes section so new contributors run linting checks ahead of time.
• Added a note instructing contributors to search the main jx repository using label filters for open source contributions.

Signed-off-by: Mallikarjunadevops mallikarjunadevops@example.com
Signed-off-by: Mallikarjuna muchu.mallikarjunarpa@gmail.com

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