fix relative urls regex in cdn to work with dots

[mostafa-hisham]

Description

fix relative urls regex in cdn to work with dots

Fixes #3724

Type of change

• Bug fix (non-breaking change which fixes an issue).

Is the solution different from the one proposed during the grooming?

No

Checklists

Generic development checklist

• [x] My code follows the style guidelines of this project, with adapted comments and without new warnings.
• [x] I have added unit and integration tests that prove my fix is effective or that my feature works.
• [x] The CI passes locally with my changes (including unit tests, integration tests, linter).
• [x] Any dependent changes have been merged and published in downstream modules.
• [ ] If applicable, I have made corresponding changes to the documentation. Provide a link to the documentation.

Test summary

• [x] I triggered all changed lines of code at least once without new errors/warnings/notices.
• [x] I validated all Acceptance Criteria of the related issues. (If applicable, provide proof).
• [ ] I validated all test plan the QA Review asked me to.

If not, detail what you could not test.