Revert "[test] Remove not-fixed yet testcases (#1268)"

This reverts commit 191eef823fe95355425621f8e002dfe7fe632383.
diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-fuzzer-4548492505645056 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-fuzzer-4548492505645056
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diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-fuzzer-6210176798425088 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-fuzzer-6210176798425088
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+++ b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-fuzzer-6210176798425088
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diff --git a/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5738888765636608 b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5738888765636608
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+++ b/test/fuzzing/fonts/clusterfuzz-testcase-minimized-hb-shape-fuzzer-5738888765636608
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