Fixes #7143 Update file structure for local fonts & CSS fonts

[remyperona]

Description

Fixes #7143

Type of change

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

Detailed scenario

The following structure is now used:

• base directory is google-fonts
• CSS files are saved in the google-fonts/css folder
• Fonts files are saved in the google-fonts/fonts folder

Technical description

Documentation

Updated the code for the file structure to reflect the needed changes. Also added a check for the local CSS file, to skip the file creation if it already exists.

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.

Additional Checks

• In the case of complex code, I wrote comments to explain it.
• When possible, I prepared ways to observe the implemented system (logs, data, etc.).
• I added error handling logic when using functions that could throw errors (HTTP/API request, filesystem, etc.)

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -0.10%)	✅ 85.19% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d285f66)	38425	16870	43.90%
Head commit (a9c8333)	38431 (+6)	16873 (+3)	43.90% (+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 (#7166)	27	23	85.19%

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]

Thank you, @remyperona, for this PR.
I can confirm that:
✓ the hash is no longer added to the font file
✓ google-font folder is now google-fonts
✓ CSS is stored under css sub-directory: cache/fonts/1/google-fonts/css
✓ Fonts are stored under fonts sub-directory: cache/fonts/1/google-fonts/fonts