don't pass in the root directory to prettier (unconditionally)

[arvidn]

it makes prettier scan the whole repository.
Instead, rely on pre-commit to pass in the relevant files.
Also extend .gitignore to include the fuzz corpus

[coveralls-official]

Pull Request Test Coverage Report for Build 10299452556

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 404 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-2.8%) to 81.107%

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Files with Coverage Reduction	New Missed Lines	%
crates/chia-consensus/src/gen/owned_conditions.rs	1	96.0%
crates/chia-consensus/src/gen/validation_error.rs	1	25.81%
crates/chia-traits/src/streamable.rs	1	94.03%
wheel/src/run_program.rs	2	94.29%
crates/chia-consensus/src/gen/run_block_generator.rs	3	95.56%
crates/chia-consensus/src/gen/conditions.rs	5	99.26%
crates/chia-consensus/src/merkle_tree.rs	30	91.22%
wheel/src/run_generator.rs	59	5.33%
wheel/src/api.rs	149	52.27%
crates/chia-protocol/src/program.rs	153	26.95%

Totals
Change from base Build 10290976970:	-2.8%
Covered Lines:	11900
Relevant Lines:	14672

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💛 - Coveralls