Update Gutenberg plugin release

[maxschmeling]

Summary

• Adds Gutenberg integration folder vip-integrations/gutenberg-0.2-20261012.
• The Gutenberg artifact was built directly from origin/trunk commit e02fb92510ea581dc4954f8b57dda153a313543d (plugin version 24.2.0-rc.1).
• VIP RTC remains on minor artifact vip-integrations/vip-real-time-collaboration-0.5, currently release v0.5.2.
• Removes no stale custom Gutenberg or RTC folders because every existing folder is referenced by develop, staging, or production.

Deployed-stage versions preserved

• develop: Gutenberg 0.2-20261005, RTC 0.5 (v0.5.2)
• staging: Gutenberg 0.2-20261005, RTC 0.5 (v0.5.2)
• production: Gutenberg 0.2-20260914, RTC 0.5 (v0.5.2)

The corresponding folders gutenberg-0.2-20261005, gutenberg-0.2-20260914, and vip-real-time-collaboration-0.5 remain present alongside the new artifact.

Validation

• Full Gutenberg plugin build succeeded under Node 24.19.0 and npm 11.18.0, as required by current trunk.
• Gutenberg source: e02fb92510ea581dc4954f8b57dda153a313543d from current origin/trunk at build time and final verification.
• Gutenberg ZIP SHA-256: 5d6112a5c121d5995e832dcc13fb33a8e33d4863e3274bdba93f2d8917aa853f.
• unzip -tq gutenberg.zip passed (2,151 files; 252,760,399 uncompressed bytes).
• Confirmed the extracted Gutenberg plugin contains gutenberg.php and build/build.php and reports version 24.2.0-rc.1.
• VIP RTC release: https://github.com/Automattic/vip-real-time-collaboration/releases/tag/v0.5.2
• cd ci && npm test passed: 15 tests.
• Confirmed all deployed-stage integration folders remain present alongside the new folder.
• git diff --check reports whitespace in upstream generated Gutenberg build files; the release artifact was imported without modifying generated output.