Support Task cancellation

[crazytonyli]

Description

The URLSession.perform() async function in HTTPClient currently only supports cancellation via Progress, but does not support cancelling via its running Task. This PR adds that missing support.

The changes are pretty minimal. It's easier to review by hiding whitespace in the diff.

WordPressKit.zip

Testing Details

See the new unit test.

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• Please check here if your pull request includes additional test coverage.
• I have considered if this change warrants release notes and have added them to the appropriate section in the CHANGELOG.md if necessary.

[dangermattic]

	1 Warning
⚠️	Package.swift was changed without updating its corresponding Package.resolved. Please resolve the Swift packages as appropriate to your project setup (e.g. in Xcode or by running swift package resolve).

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[kean]

The changes are pretty minimal. It's easier to review by hiding whitespace in the diff.

Nice tip. I didn't know that.