devtools: implement clearBreakpoint (#42154)

Add an event listener for `clearBreakpoint` to `debugger.js` and the
necessary glue to access it from the `devtools` crate.

Testing: `./mach test-devtools` and manual testing.
Fixes: Part of: https://github.com/servo/servo/issues/36027

---------

Signed-off-by: atbrakhi <atbrakhi@igalia.com>
Co-authored-by: eri <eri@igalia.com>

components/shared/devtools/lib.rs

@@ -309,6 +309,7 @@ pub enum DevtoolScriptControlMsg {
 
     GetPossibleBreakpoints(u32, GenericSender<Vec<RecommendedBreakpointLocation>>),
     SetBreakpoint(u32, u32, u32),
+    ClearBreakpoint(u32, u32, u32),
     Pause(GenericSender<PauseFrameResult>),
 }