Fix release e2e local testing on macOS / npm >= 11 (prerelease --tag + gradle.properties) (#57469)

[zeyap]

Summary:
Two fixes that make test-release-local work again for release-candidate testing on macOS with modern npm. Both are in the local release-testing scripts only (no product code).

1. npm publish needs --tag for prereleases (npm >= 11)

Publishing the monorepo packages to the local Verdaccio proxy fails on npm >= 11 for a prerelease version (e.g. 0.87.0-rc.0):

react-native/asset-utils (packages/asset-utils) ........................ Failed ❌
npm error You must specify a tag using --tag when publishing a prerelease version.

npm now refuses to publish a prerelease to the default latest dist-tag without an explicit --tag. Fix: when the version is a prerelease (contains -), pass --tag prerelease. Stable versions are unaffected. (scripts/e2e/init-project-e2e.js)

2. echo -e corrupts gradle.properties on macOS

Setting up the Android test project, the script appends the maven-local repo path with echo -e. On macOS, /bin/sh's echo doesn't support -e, so it writes a literal -e onto the previous property, corrupting the file:

Cannot parse project property android.newDsl='false-e ' of type
'class java.lang.String' as boolean. Expected 'true' or 'false'.

Fix: use printf, which is portable. (scripts/release-testing/test-release-local.js)

Changelog

[INTERNAL] - Fix test-release-local for prerelease testing on macOS / npm >= 11

Test Plan:
On npm 11.4.2 / Node 24, yarn test-release-local -t RNTestProject -p Android -c <token> against 0.87.0-rc.0:

• Before: failed at "Publishing packages to local npm proxy" (prerelease --tag error); after working around that, failed at app:installDebug with the android.newDsl='false-e ' parse error.
• After: packages publish to the local proxy with --tag prerelease, gradle.properties gets a well-formed react.internal.mavenLocalRepo line, and the app builds/installs against the RC's maven-local artifacts.
• iOS (-t RNTestProject -p iOS) also gets past the publish step with fix nil #1.
• Stable (non-prerelease) versions: publishTag is empty and printf behaves identically, so no behavior change.

Reviewed By: christophpurrer

Differential Revision: D110925222

Pulled By: zeyap

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