Closes #7289: 3.19 Preconnect to external domains - exclusions filter

[jeawhanlee]

Description

Fixes #(issue number)
Makes beacon compatible array of strings exclusion patterns

Type of change

• New feature (non-breaking change which adds functionality).
• Enhancement (non-breaking change which improves an existing functionality).

Detailed scenario

What was tested

Elements having patterns in array exclusions are excluded as expected.

How to test

For default exclusions:
Add a template with elements having the following attribute or having the domain name - https://static.cloudflareinsights.com

• rel="profile"
• rel="preconnect"
• rel="dns-prefetch"
• rel="icon"

or you can add a new pattern with the filter preconnect_external_domain_exclusions and check that the element containing the patter is excluded as expected.

Technical description

Documentation

First we loop through the exclusions pattern and check if the outerHTML of the element contains each exclusion pattern.

New dependencies

N/A

Risks

N/A

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.

Unticked items justification

Not applicable to the changes in this PR.

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
Report missing for 83abe181	✅ 100.00% (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (83abe18)	Report Missing	Report Missing	Report Missing
Head commit (c7c1667)	1398	1113	79.61%

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 (#52)	11	11	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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Footnotes

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