Closes #7068 admin UI for host fonts locally

[remyperona]

Description

Fixes #7068

Add admin UI & option sanitization for the new host fonts locally option

Type of change

• Sub-task of Host Google Fonts Locally #7039

Detailed scenario

• Host Google Font option is added in the media tab as a checkbox below the Image Dimensions section
• The text under the media tab changes to “LazyLoad, image dimensions, font optimization”
• The section heading is “Fonts”
• The section description is “Download and serve fonts directly from your server. Reduces connections to external servers and minimizes font shifts. More info” (need links to documentation, FR and EN)
• The checkbox label is “Host Google Fonts locally”
• When enabling the option, the option is there in the options table

Technical description

Documentation

Added new sections for the fonts & host fonts locally in the admin.
Added initialization and sanitization of the host fonts locally option in the WPR settings.

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
Report missing for 1a097421	❌ 36.96% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1a09742)	Report Missing	Report Missing	Report Missing
Head commit (63e4520)	38155	16707	43.79%

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 (#7094)	46	17	36.96%

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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Footnotes

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[Mai-Saad]

Working as expected (fresh install , update, rollback and import settings). if nothing is needed for CI failed above then we can merge.
https://wpmediaqa.testrail.io/index.php?/cases/view/16909
https://wpmediaqa.testrail.io/index.php?/cases/view/16911
https://wpmediaqa.testrail.io/index.php?/cases/view/16912