Closes #7246 3.19 - Preconnect to external domains - Beacon insertion part

[Khadreal]

Description

Fixes #7246

Type of change

• New feature (non-breaking change which adds functionality).

Detailed scenario

N/A

Technical description

Documentation

Add factory class for Preload fonts to service provider

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.
• Output messages (errors, notices, logs) are explicit enough for users to understand the issue and are actionnable.

[Khadreal]

Test is failing which would be resolve when this issue is completed.

[Miraeld]

Changes seems ok to me, however need to fix the tests if it's possible @Khadreal

[MathieuLamiot]

@Khadreal @Miraeld Should this go back to In Progress then?
If this needs another PR to fix the test, please write it down here so we can know what needs to be done.

[Khadreal]

fix the test, please write it down

Left a comment here #7301 (comment), the tests failing are dependent on the #7248 PR

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.05% (target: -0.10%)	❌ 26.83% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b7d7412)	39176	17188	43.87%
Head commit (5d1a868)	39217 (+41)	17224 (+36)	43.92% (+0.05%)

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 (#7301)	41	11	26.83%

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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