Closes #7064 CDN Compatibility for host fonts locally

[remyperona]

Description

Fixes #7064

Apply CDN URL on local fonts CSS & fonts files

Type of change

• Sub-task of Host Google Fonts Locally #7039

Detailed scenario

• Enable CDN
• local CSS and fonts should have their URLs rewrittent to the CDN URL

Technical description

Documentation

Use the existing filters we have rocket_css_url and rocket_css_content to apply CDN.

Mandatory Checklist

Code validation

• I validated all the Acceptance Criteria. If possible, provide screenshots or videos.
• I triggered all changed lines of code at least once without new errors/warnings/notices.
• I implemented built-in tests to cover the new/changed code.

Code style

• I wrote a self-explanatory code about what it does.
• I protected entry points against unexpected inputs.
• I did not introduce unnecessary complexity.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.10%)	✅ 100.00% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b96427d)	38431	16873	43.90%
Head commit (5cee326)	38432 (+1)	16874 (+1)	43.91% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#7169)	2	2	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[hanna-meda]

Thanks for the PR, @remyperona.
After testing it, I came across one finding:
• When a CDN is set up and then disabled, the CDN path sometimes remains in the CSS for font URLs, while other pages correctly display the local path.
Page example with local path in both CSS and font URLs (inside CSS file) =>
https://newer.rocketlabsqa.ovh/gf-v1v2-image/
Page example where local path in CSS but CDN path for font URLs (inside CSS file) =>
https://newer.rocketlabsqa.ovh/merianda-obscure-gf-font/

Note: This can be reproduced also when using One's CDN service.

[remyperona]

Good catch, I fixed this in the PR that is handling clearing of the data 1ca09d9

[MathieuLamiot]

Should this go back to QA then? @remyperona @hanna-meda

[hanna-meda]

I fixed this in the PR that is handling clearing of the data 1ca09d9

Checked the fix for this on 1ca09d9 but it can still be reproduced for some pages. @remyperona, if you'll continue to fix it on task/7071-clear-data PR, then this task can be closed as done.

[hanna-meda]

Closing this as done with note that TCs in TP will be included and retested under #7110's testing plan.
cc @Mai-Saad