Improve contributing guide

[kubabuczak]

Description

Added a "Rebasing your branch" section to docs/CONTRIBUTING.md covering rebase workflow and commit hygiene before merge.

Key Changes

• docs/CONTRIBUTING.md: Added new "Rebasing your branch" subsection between "Pull requests" and "Code Review", with guidance on rebasing onto develop, resolving conflicts, using --force-with-lease, and squashing via GitHub UI or local interactive rebase. Updated table of contents accordingly.

Testing and Verification

Documentation-only change — verified markdown renders correctly.

Related Issues

N/A

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[patrykw-splunk]

LGTM!