[NFC] Fix tests that were polluting the test directory #6498
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A few tests were creating files with the
%sprefix, which expands to the testfilename itself, so the test files were being created in the test directory and
were never cleaned up. Another test was creating files called
%a.wastand%b.wast, but%aand%bdo not expand to anything, so this also pollutedthe test directory and caused problems with running other tests and fuzzing.
Use the proper
%tprefix to create all these files in a temporary locationinstead.
Fixes #6429.