🎈 Add Minecraft pc 26.1 data

[rom1504bot]

This automated PR sets up the relevant boilerplate for Minecraft pc version 26.1. Fixes #1159.

Related:

• Issue: Support Minecraft PC 26.1 #1159
• Protocol Version: 775
• 🎈 Add version 26.1 minecraft-data-generator#70

• You can help contribute to this PR by opening a PR against this pc_26_1 branch instead of master.

[extremeheat]

Need to fix mc source cloning script to use prefix that can be .gitignore'd

[extremeheat]

@copilot please fix CI issues by 1. running npm run build to regen/resync the yaml, 2. update the scripts in tools/js that clone mc source to use a prefix for where to clone src code, then update .gitignore to replace "1.*" with a src code prefix so tools/js/26.1 can be removed

[Copilot]

@copilot please fix CI issues by 1. running npm run build to regen/resync the yaml, 2. update the scripts in tools/js that clone mc source to use a prefix for where to clone src code, then update .g...

Addressed in commits 63ea4b8 and fc28ccc: ran npm run build to resync generated protocol JSON, updated tools/js mc source clone scripts to use mcsrc-<version> prefix, updated tools/js/.gitignore from 1.* to mcsrc-*, and removed tools/js/26.1 from the PR.