chore(jest-util): replace slash with inline implementation

[roli-lpci]

Summary

Replace the slash package with an inline implementation in jest-util. The entire slash package is path.replace(/\\/g, '/') — a one-liner that doesn't need an external dependency.

• New slash function exported from jest-util (3 lines, uses String.prototype.replaceAll)
• Updated imports across all 20 consumer files (15 .ts source files, 3 .js test files, 2 e2e test fixtures)
• Removed slash from all 14 package.json dependency entries (13 packages + root)
• Added jest-util dependency to babel-jest, jest-message-util, and @jest/test-sequencer (which didn't previously depend on it)

Note: this does not touch replacePathSepForGlob, which is a different function that only replaces path.sep (preserving glob escape chars).

Test plan

• ESLint clean on all 20 modified source files
• Prettier clean
• yarn constraints passes
• yarn dedupe --check passes
• No remaining from 'slash' or require('slash') imports outside node_modules

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: roli-lpci / name: Roli Bosch (2770ec4, 51cb3f0, 6140ef9, a45b213, c2a3ef3)

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commit: 0d3f4f9