fix relative path wrong in pge edition

[flowerpoetryLover]

What this PR does:
The main fix addresses the issue where editing repository files on the page could not be applied to specified paths. It now enables creating new files under designated paths.

Which issue(s) this PR fixes:

Fixes # gitlab-809

Type of changes
Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Feature/Issue validation/testing:

Please describe the tests that you ran to verify your changes and relevant result summary.

• Test A

• Test B

• Logs

Special notes for your reviewer:

Checklist:

• I have added unit/e2e tests that prove your fix is effective or that this feature works.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• I have reviewed my own code and ensured that it follows the project's style guidelines.

Release note:

[zhendi]

LGTM

[zhendi]

LGTM

[zhendi]

@flowerpoetryLover conflicts need fix