Set C/C++ go-to fallback defaults between definition and declaration

[Prashant Kumar Rai (8prashant)]

This PR improves C/C++ navigation defaults so definition and declaration commands fall back to each other automatically.

Linked issue

Fixes #14509

What changed

• Updated C/C++ language-specific configuration defaults to set:
  • editor.gotoLocation.alternativeDefinitionCommand = editor.action.revealDeclaration
  • editor.gotoLocation.alternativeDeclarationCommand = editor.action.revealDefinition
• Applied for:
  • [c]
  • [cpp]
  • [cuda-cpp]

Why

This provides smoother F12 behavior across declaration/definition contexts without requiring users to create custom keybindings by file extension.

Test coverage

• Added a unit test that validates these defaults are present in package.json for [c], [cpp], and [cuda-cpp].
• Test executed:
  • ./node_modules/.bin/mocha.cmd dist/test/unit/gotoLocationDefaults.test.js --timeout 30000
• Result: passing (1 test).

[Copilot]

Pull request overview

Adds reciprocal declaration/definition navigation fallbacks for C, C++, and CUDA C++.

Changes:

• Configures declaration and definition fallback commands.
• Adds unit coverage for all supported language defaults.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
Extension/package.json	Adds language-specific navigation defaults.
Extension/test/unit/gotoLocationDefaults.test.ts	Verifies the defaults for C, C++, and CUDA C++.

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