Add notebook commands to collapse code cell inputs

[AlexanderMerkel]

Adds command-palette actions to collapse and expand inputs for code cells only:

• Notebook: Collapse All Code Cell Inputs
• Notebook: Expand All Code Cell Inputs

The existing all-cell input collapse/expand commands are unchanged. These new commands let notebook users hide code inputs while keeping rendered markdown cells visible, which is useful for presentation-style notebook reading.

Testing:

• npm run compile-check-ts-native
• npm run valid-layers-check
• node node_modules/eslint/bin/eslint.js --quiet src/vs/workbench/contrib/notebook/browser/contrib/cellCommands/cellCommands.ts
• node test/unit/browser/index.js --run src/vs/workbench/contrib/notebook/test/browser/view/cellPart.test.ts --browser chromium --sequential

Fixes #212186

[Copilot]

Pull request overview

Adds notebook command-palette actions for collapsing and expanding inputs on code cells only, leaving markdown cell inputs unaffected.

Changes:

• Introduces command IDs for collapsing/expanding all code cell inputs.
• Registers two new notebook actions in the Command Palette.
• Adds a helper to iterate only code cells.

[AlexanderMerkel]

@microsoft-github-policy-service agree