Fix intermittent failure in the stamp editor's undo-related integration tests #19949
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The clipboard, used via the
copyImage
helper function, is a shared resource, so access to it cannot happen concurrently because it could result in tests overwriting each other's contents. Most tests using the clipboard are therefore run sequentially, but only the stamp editor's undo-related tests weren't, so this commit fixes the issue by running those tests sequentially too..Fixes #19948.
This patch is easier to review with https://github.com/mozilla/pdf.js/pull/19949/files?w=1.