add fuzz coverage for all session ticket formats

[jmayclin]

Problem:

Thanks to the work in #4960 , we can see that the de-serialization logic for S2N_SERIALIZED_FORMAT_TLS12_V3 is not currently being fuzz tested.

Solution:

We manually set the first byte of the session ticket using the modulus operator

s2n-tls/tests/fuzz/s2n_deserialize_resumption_state_test.c

Lines 47 to 48 in aaae641

	randval = randval % S2N_SERIALIZED_FORMAT_TLS12_V3;
	POSIX_GUARD(s2n_stuffer_write_uint8(&fuzzed_ticket, randval));

But this means randval will never actually be S2N_SERIALIZED_FORMAT_TLS12_V3.

My preferred solution is to completely remove the manual input setting. I expect that libfuzzer (with a nice corpus) will be able to find all branches.

Requirements / Acceptance Criteria:

1. add fuzz test coverage of S2N_SERIALIZED_FORMAT_TLS12_V3.
2. generate fuzz test coverage locally to confirm that the function is covered.