WPSC: Remove outside dependency device detection

[kraftbj]

Fixes #45784
Fixes FORMS-389

Proposed changes:

• Adds the device detection code directly into WPSC.

The JP ecosystem expects the JP autoloader to load the latest version of a package, no matter which plugin provides it. WPSC hardcoded it's own included version resulting in issues where other JP plugins are expecting a new version of this package, but it is not available.

Since WPSC is legacy, electing to embed the code instead of adding the autoloader. This ensures that future development of the package won't have a knock-on effect to WPSC without more intentional inclusion.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
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Jetpack product discussion

n/a

Does this pull request change what data or activity we track or use?

no.

Testing instructions:

• TBA

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Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/super-cache/plugins/jetpack.php	0/56 (0.00%)	0.00%	-1 💚

3 files are newly checked for coverage.

File	Coverage
projects/plugins/super-cache/src/device-detection/class-device-detection.php	0/25 (0.00%) 💔
projects/plugins/super-cache/src/device-detection/class-user-agent-info.php	0/1049 (0.00%) 💔
projects/plugins/super-cache/src/device-detection/functions.php	0/6 (0.00%) 💔

Full summary · PHP report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[donnchawp]

Looks good. Thanks for sorting out that problem.