Background - do not sign commits in the background agent session

[lszomoru]

Related microsoft/vscode#291669

[Copilot]

Pull request overview

This PR prevents GPG commit signing in background agent sessions by making commit options configurable through the IGitService.commit() interface. The changes address VS Code issue #291669 by adding signCommit: false to commits made in background agent worktrees.

Changes:

• Extended IGitService.commit() interface to accept optional CommitOptions parameter
• Updated the single call site in ChatSessionWorktreeService to explicitly disable commit signing with signCommit: false

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/platform/git/common/gitService.ts	Added optional CommitOptions parameter to commit() method signature in IGitService interface
src/platform/git/vscode/gitServiceImpl.ts	Updated commit() implementation to accept and pass through CommitOptions to underlying repository API
src/platform/ignore/node/test/mockGitService.ts	Updated mock implementation to match new interface signature
src/platform/test/node/simulationWorkspaceServices.ts	Updated test service implementation to match new interface signature
src/extension/chatSessions/vscode-node/chatSessionWorktreeServiceImpl.ts	Updated the single call site to explicitly pass { all: true, noVerify: true, signCommit: false }