Translate path separators when parsing npm direct imports

[galargh]

• Because this PR includes a bug fix, relevant tests have been included.
• Because this PR includes a new feature, the change was previously discussed on an Issue or with someone from the team.
• I didn't do anything of this.

---

Resolves #6051

The issue was that we used POSIX path separators in the dependenciesToCompile, but then we weren't translating them to system-aware paths anywhere along the way. Eventually, it made it all the way through to https://github.com/NomicFoundation/hardhat/blob/v-next/v-next/hardhat-utils/src/fs.ts#L120, which expects system-specific path separators, and that's where we errored out.

The resolver for npm paths is https://github.com/NomicFoundation/hardhat/blob/v-next/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/resolver/dependency-resolver.ts#L250. I added the path separator translator to https://github.com/NomicFoundation/hardhat/blob/v-next/v-next/hardhat/src/internal/builtin-plugins/solidity/build-system/resolver/dependency-resolver.ts#L254 because it seemed like the most natural option.

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Name	Status	Preview	Comments	Updated (UTC)
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[github-actions]

hardhat

Total size of the bundle: 229M
Total number of dependencies (including transitive): 61

List of dependencies (sorted by size)

224M	total
30M	@ignored/edr-optimism-linux-x64-musl
30M	@ignored/edr-optimism-linux-x64-gnu
27M	@ignored/edr-optimism-linux-arm64-musl
27M	@ignored/edr-optimism-linux-arm64-gnu
22M	@ignored/edr-optimism-win32-x64-msvc
21M	@ignored/edr-optimism-darwin-x64
20M	esbuild
20M	@ignored/edr-optimism-darwin-arm64
8.9M	solc
2.8M	@sentry/tracing
2.5M	micro-eth-signer
1.9M	@noble/curves
1.7M	undici
1.2M	@sentry/types
1.2M	@noble/hashes
932K	@sentry/node
920K	@sentry/utils
856K	zod
816K	@ignored/hardhat-vnext-utils
616K	micro-packed
576K	tsx
548K	@sentry/core
504K	fast-equals
492K	@scure/bip39
460K	@ignored/edr
384K	@ignored/edr-optimism
368K	ethereum-cryptography
344K	@sentry/hub
320K	enquirer
320K	@ignored/hardhat-vnext-errors
284K	semver
192K	ws
188K	commander
168K	@scure/base
136K	adm-zip
128K	get-tsconfig
96K	@scure/bip32
92K	chalk
88K	tslib
88K	@sentry/minimal
84K	js-sha3
76K	agent-base
72K	@nomicfoundation/solidity-analyzer
68K	debug
64K	lru_map
64K	https-proxy-agent
60K	@ignored/hardhat-vnext-zod-utils
56K	rfdc
56K	follow-redirects
48K	memorystream
48K	command-exists
48K	ansi-colors
44K	tmp
40K	resolve-pkg-maps
36K	p-map
32K	cookie
24K	strip-ansi
24K	env-paths
24K	ansi-regex
20K	os-tmpdir
20K	ms

[antico5]

Great find!