[ofalvai]

What changes

Replace unnecessary NPM dependencies. All in the context of the E2E test harness, so there is no risk if breaking library code.

Each package gets replaced by a built-in with the same behavior for how we call it:

Package	Replacement
del, mkdirp	fs.rmSync and fs.mkdirSync with recursive: true
slash	a \ to / regex on the one path that needs it
replace	read the file, String.replace, write it back
querystring	URLSearchParams in the unit tests

The lockfile loses about 500 lines, mostly the old del tree (globby, rimraf, p-map and friends).

[Copilot]

🟢 Approval recommended

No active review issues remain for the test-tooling and dependency cleanup.

No open issues 🎉

What changed in this PR

This PR reduces dependencies in CodePush’s test infrastructure by replacing utility packages with Node.js and JavaScript built-ins. The changes are limited to test tooling and dependency metadata.

Changes:

• Use built-in filesystem operations, path normalization, and string replacement in test helpers.
• Replace querystring parsing with URLSearchParams in acquisition SDK tests.
• Remove unused dependencies and their transitive lockfile entries.

File	Description
test/​test.mts	Replace directory utilities and path normalization with built-ins.
test/​codesign.mts	Create signature directories with fs.mkdirSync.
src/​acquisition-sdk/​__tests__/​capabilities.test.ts	Parse and assert query parameters with URLSearchParams.
src/​acquisition-sdk/​__tests__/​acquisition-rest-mock.ts	Use URLSearchParams to parse mock update requests.
package.json	Remove direct del, mkdirp, and slash dependencies.
package-lock.json	Remove unused utility packages and transitive dependencies.
code-push-plugin-testing-framework/​script/​testUtil.js	Replace the replace package with filesystem and string operations.
code-push-plugin-testing-framework/​package.json	Remove the replace dependency.

_{Review effort: Balanced}