Use workspace Clippy lints in benchmarks

[BD103]

Our benchmarks are slightly out of date, and as such fail quite a few Clippy lints. We should copy over [our lint configuration] and fix any warnings:

bevy/Cargo.toml

Lines 33 to 61 in 00722b8

	[workspace.lints.clippy]
	doc_markdown = "warn"
	manual_let_else = "warn"
	match_same_arms = "warn"
	redundant_closure_for_method_calls = "warn"
	redundant_else = "warn"
	semicolon_if_nothing_returned = "warn"
	type_complexity = "allow"
	undocumented_unsafe_blocks = "warn"
	unwrap_or_default = "warn"
	needless_lifetimes = "allow"
	ptr_as_ptr = "warn"
	ptr_cast_constness = "warn"
	ref_as_ptr = "warn"
	# see: https://github.com/bevyengine/bevy/pull/15375#issuecomment-2366966219
	too_long_first_doc_paragraph = "allow"
	std_instead_of_core = "warn"
	std_instead_of_alloc = "warn"
	alloc_instead_of_core = "warn"
	[workspace.lints.rust]
	missing_docs = "warn"
	unexpected_cfgs = { level = "warn", check-cfg = ['cfg(docsrs_dep)'] }
	unsafe_code = "deny"
	unsafe_op_in_unsafe_fn = "warn"
	unused_qualifications = "warn"