chore: add gitattributes linguist-vendored for tests

[rakita]

rm test json files

[github-actions[bot]]

Valgrind Results:

==3965== Cachegrind, a cache and branch-prediction profiler
==3965== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3965== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3965== Command: target/release/snailtracer
==3965== 
--3965-- warning: L3 cache found, using its data for the LL simulation.
Running snailtracer example!
elapsed: 1.821295856s
==3965== 
==3965== I   refs:      427,439,026
==3965== I1  misses:          3,171
==3965== LLi misses:          2,854
==3965== I1  miss rate:        0.00%
==3965== LLi miss rate:        0.00%
==3965== 
==3965== D   refs:      203,986,857  (132,175,935 rd   + 71,810,922 wr)
==3965== D1  misses:        342,748  (    202,811 rd   +    139,937 wr)
==3965== LLd misses:        137,711  (      4,396 rd   +    133,315 wr)
==3965== D1  miss rate:         0.2% (        0.2%     +        0.2%  )
==3965== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3965== 
==3965== LL refs:           345,919  (    205,982 rd   +    139,937 wr)
==3965== LL misses:         140,565  (      7,250 rd   +    133,315 wr)
==3965== LL miss rate:          0.0% (        0.0%     +        0.2%  )