Ignore query parameters when checking URL existence

[Jym77]

Test are breaking in #2007 due to query parameter in URL and the test not finding a file with the exact same name. This should ignore the query parameters when searching for existence of files.

There is a small risk that it would also ignore a fragment after a query parameter, but that doesn't seem to be something we are doing now, so this is likely OK.

Closes issue(s):

• N/A

Need for Call for Review: This will not require a Call for Review (updating test code only).

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