refactor(@angular/cli): migrate build and test MCP tools into specialized target strategy handlers

Migrate build and unit-test MCP tools from standalone tools into specialized target strategy handlers in the tools/run-target subdirectory. Restrict BuildTargetStrategy to known official builders, parsing execution logs to extract output paths and extending payload metadata. Restrict UnitTestTargetStrategy to known test runner builders, auto-injecting non-interactive one-off watch mode flags and automatically configuring headless options for Karma jasmine suites. Handle all other targets and builders via the GenericTargetStrategy.