fix(devcontainer): exclude synthesized devcontainer configs from git

[skevetter]

Summary

When a devcontainer config is synthesized rather than imported from a path, the generated file was written to the workspace root but never added to .git/info/exclude, so it showed up as an untracked file (e.g. .devcontainer.devsy.json after passing an image reference).

Only the imported-path source (importExternalDevContainer) excluded its artifact. This adds the same excludeFromGit call to the two synthesizing paths:

• saveSynthesizedConfig — used for image sources and --devcontainer-source none (writes .devcontainer.devsy.json)
• getDefaultConfig — the auto-detection fallback (writes .devcontainer.json)

Both degrade gracefully outside a git repo and only log at debug on failure, matching the existing import path.

Adds TestSaveSynthesizedConfig_AddsGitExclude.

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📥 Commits

Reviewing files that changed from the base of the PR and between c07b339 and e67fd35.

📒 Files selected for processing (2)

• pkg/devcontainer/config.go
• pkg/devcontainer/import_external_test.go

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