refactor(vscode): centralise error handlers

[benfdking]

No description provided.

[Copilot]

Pull Request Overview

This PR centralises error handling by introducing a single handleError entrypoint and refactors calling code to use it instead of duplicated switch statements.

• Adds handleError in errors.ts and converts per-case handlers to internal functions.
• Refactors LSP activation/restart and format command to call handleError.
• Removes repetitive switch blocks and cleans up imports.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
vscode/extension/src/utilities/errors.ts	Added handleError, made existing handlers internal, and added JSDoc for new interface
vscode/extension/src/extension.ts	Replaced inline switch on lspClient errors with handleError calls
vscode/extension/src/commands/format.ts	Updated format command to import and use handleError instead of switches

Comments suppressed due to low confidence (2)

vscode/extension/src/utilities/errors.ts:75

• Correct the typo in the log message to match the function name: change 'handleNotSginedInError' to 'handleNotSignedInError'.

traceInfo('handleNotSginedInError')

vscode/extension/src/utilities/errors.ts:29

• Add unit tests for the new handleError function to cover each error type branch, including cases with and without genericErrorPrefix, to ensure centralised error handling behaves correctly.

export async function handleError(