fix: SVG sanitization for file uploaded with 'sideload' action

[Soare-Robert-Daniel]

Closes https://github.com/Codeinwp/otter-internals/issues/242

Summary

The sanitize function was already added for wp_handle_upload_prefilter, but the files uploaded via the WP rest endpoint for media triggered this filter.

On closer inspection of the endpoint source code, instead of upload, it was using a sideload action. Thus, I also included it as a part of the filter wp_handle_sideload_prefilter.

Besides this, the filename will have a random suffix attached per recommendations.

• The test has been updated for the new behavior.
• Added a new test for non-SVG files with the world's smallest png file.

Screenshots

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Checklist before the final review

• Included E2E or unit tests for the changes in this PR.
• Visual elements are not affected by independent changes.
• It is at least compatible with the minimum WordPress version.
• It loads additional script in frontend only if it is required.
• Does not impact the Core Web Vitals.
• In case of deprecation, old blocks are safely migrated.
• It is usable in Widgets and FSE.
• Copy/Paste is working if the attributes are modified.
• PR is following the best practices

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Bundle Size Diff

Package	Old Size	New Size	Diff
Animations	271.41 KB	271.41 KB	0 B (0.00%)
Blocks	1.56 MB	1.56 MB	0 B (0.00%)
CSS	100.89 KB	100.89 KB	0 B (0.00%)
Dashboard	198.45 KB	198.45 KB	0 B (0.00%)
Onboarding	161.1 KB	161.1 KB	0 B (0.00%)
Export Import	97.78 KB	97.78 KB	0 B (0.00%)
Pro	423.27 KB	423.27 KB	0 B (0.00%)

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E2E Tests

Playwright Test Status:

Performance Results

serverResponse: 239.95, firstPaint: 551.75, domContentLoaded: 1570, loaded: 1570.75, firstContentfulPaint: 3554.55, firstBlock: 7974.55, type: 13.2, minType: 11.97, maxType: 15.28, typeContainer: 9.71, minTypeContainer: 7.4, maxTypeContainer: 12.26, focus: 34.21, minFocus: 30.39, maxFocus: 42.92, inserterOpen: 23.27, minInserterOpen: 20.96, maxInserterOpen: 27.94, inserterSearch: 0.92, minInserterSearch: 0.77, maxInserterSearch: 1.13, inserterHover: 3.08, minInserterHover: 2.61, maxInserterHover: 4.46, listViewOpen: 151.03, minListViewOpen: 137.15, maxListViewOpen: 173.84

[pirate-bot]

🎉 This PR is included in version 3.0.5 🎉

The release is available on GitHub release

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