Parse "Query.find always expects to find 1 element, but it found 2 instead." errors

Bug introduced in 3.6.2.

<body>
    <button>A</button>
    <button>A</button>
</body>

ProgramTest.clickButton "A"

TODO:

[ ] Add a failing test in tests/ProgramTestTests/UserInput/ClickButtonTest.elm
[ ] grab the current error message from that and use it to add a test in tests/ProgramTest/TestHtmlHacksTest.elm
[ ] implement parsing of the error message in src/ProgramTest/TestHtmlParser.elm
[ ] make sure tests pass now
[ ] update CHANGELOG.md
[ ] PR should be made against or switched to the "develop" branch (not "main")

avh4 / elm-program-test