Avoid job-backed method rewrite application

[Gabriel-Darbord]

Summary

• Apply method rewrite changes directly through the refactoring change manager instead of the job-backed NewTools applier.
• Use PharoCompatibility refactoringChangeManagerClass for the Pharo 13/14 change-manager rename instead of probing globals in MCP.

Dependency

• Requires Add refactoring change manager compatibility hook PharoCompatibility#3 before CI can load the new compatibility hook from main.

Verification

• P13: MCPToolRewriteMethodsTest
• P14 scratch: PharoCompatibility refactoringChangeManagerClass resolves to ReChangeManager
• P14 scratch: MCPToolRewriteMethodsTest
• Changed Tonel file parsed TonelParser before the hook refactor
• git diff --check