Make invoke clean-all task delete worker/include/FBS (#1397)

- `worker/fbs/meson.build` produces FlatBuffers C++ include files in `worker/include/FBS` folder.
- Despite such a folder is gitignored, `cargo publish` complains if that folder and its files exist.
- So make `invoke clean-all` also delete `worker/include/FBS`.
- Bonus track: Use `shutil.rmtree(path, ignore_errors=True)` instead of wrapping it with `try/except` everywhere.

worker/tasks.py

@@ -170,37 +170,24 @@ def clean(ctx): # pylint: disable=unused-argument
     """
     Clean the installation directory
     """
-    try:
-        shutil.rmtree(MEDIASOUP_INSTALL_DIR);
-    except:
-        pass;
+    shutil.rmtree(MEDIASOUP_INSTALL_DIR, ignore_errors=True);
 
 
 @task
 def clean_build(ctx): # pylint: disable=unused-argument
     """
     Clean the build directory
     """
-    try:
-        shutil.rmtree(BUILD_DIR);
-    except:
-        pass;
+    shutil.rmtree(BUILD_DIR, ignore_errors=True);
 
 
 @task
 def clean_pip(ctx): # pylint: disable=unused-argument
     """
     Clean the local pip setup
     """
-    try:
-        shutil.rmtree(PIP_MESON_NINJA_DIR);
-    except:
-        pass;
-
-    try:
-        shutil.rmtree(PIP_PYLINT_DIR);
-    except:
-        pass;
+    shutil.rmtree(PIP_MESON_NINJA_DIR, ignore_errors=True);
+    shutil.rmtree(PIP_PYLINT_DIR, ignore_errors=True);
 
 
 @task(pre=[meson_ninja])
@@ -233,10 +220,8 @@ def clean_all(ctx):
         except:
             pass;
 
-        try:
-            shutil.rmtree(MEDIASOUP_OUT_DIR);
-        except:
-            pass;
+        shutil.rmtree(MEDIASOUP_OUT_DIR, ignore_errors=True);
+        shutil.rmtree('include/FBS', ignore_errors=True);
 
 
 @task(pre=[meson_ninja])