ci(react-sdk): update example app sdk version

[joker23]

This PR will:

1. update release please config to update the react example app sdk versions
2. convert the react example apps to use pinned sdk versions instead of workspace^
3. added env to skip electron binary download in react contract test to address flaky behavior

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Note

Low Risk
Low risk: changes are limited to CI environment variables and dependency version pinning in example apps plus release automation config updates.

Overview
Improves React SDK contract-test CI reliability by setting ELECTRON_SKIP_BINARY_DOWNLOAD=1 during dependency installation to avoid flaky concurrent Electron downloads.

Updates the server-only React example to use pinned published versions of @launchdarkly/react-sdk and @launchdarkly/node-server-sdk (instead of workspace:^), and extends release-please-config.json so releases automatically bump the SDK dependency versions in the hello-react and server-only example package.json files.

^{Written by Cursor Bugbot for commit 94f9df8. This will update automatically on new commits. Configure here.}

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 25661 bytes
Compressed size limit: 29000
Uncompressed size: 126143 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179146 bytes
Compressed size limit: 200000
Uncompressed size: 828569 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 36775 bytes
Compressed size limit: 38000
Uncompressed size: 201898 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 31371 bytes
Compressed size limit: 34000
Uncompressed size: 111380 bytes

[joker23]

@cursor review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

Comment @cursor review or bugbot run to trigger another review on this PR

[joker23]

This example was already using the pinned sdk version

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.