revert: feat(asset-server-plugin) background color query param (#4999)

[michaelbromley]

Reverts the squash-merge of #4999 from master.

That PR adds a new backgroundColor query parameter to the asset server. It is a feature, so it belongs on the minor branch rather than shipping in the next patch release from master. It was merged into master by mistake.

The change is re-applied to minor in a companion PR, which preserves the original author.

git diff between this branch and b8004ae50 (the commit immediately before the accidental merge) is empty for packages/asset-server-plugin, so this restores the package to exactly its pre-merge state.

A later master into minor backmerge will not strip the feature back out of minor. The merge sees no net change on the master side for these files, because the feature and its revert cancel out, so the version on minor is kept. This was verified with a local trial merge: the feature survived and there were no conflicts in packages/asset-server-plugin.

Relates to #4999

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📥 Commits

Reviewing files that changed from the base of the PR and between 0fec7bc and abd582b.

📒 Files selected for processing (7)

• packages/asset-server-plugin/src/asset-server.ts
• packages/asset-server-plugin/src/common.ts
• packages/asset-server-plugin/src/config/image-transform-strategy.ts
• packages/asset-server-plugin/src/config/preset-only-strategy.ts
• packages/asset-server-plugin/src/transform-image.spec.ts
• packages/asset-server-plugin/src/transform-image.ts
• packages/asset-server-plugin/src/types.ts

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud