tests: Mark tests with AddressSanitizer-detected leaks

Various tests have leaks where it isn't clear whether the data is
intentionally not freed, or leaked due to a bug. If we mark these
tests as TODO, we can skip them under AddressSanitizer and get the
rest to pass, giving us a baseline from which to avoid regressions.

Signed-off-by: Simon McVittie <smcv@collabora.com>
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