west: runners: core.py: Remove no-op try-excepts

Removing these doesn't change behavior, since the
subprocess.CalledProcessError is just immediately re-raised when caught.

Fixes this pylint warning:

    W0706: The except handler raises immediately (try-except-raise)

Fixing pylint warnings for a CI check.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>

scripts/west_commands/runners/core.py

@@ -516,10 +516,7 @@ class ZephyrBinaryRunner(abc.ABC):
         self._log_cmd(cmd)
         if _DRY_RUN:
             return
-        try:
-            subprocess.check_call(cmd)
-        except subprocess.CalledProcessError:
-            raise
+        subprocess.check_call(cmd)
 
     def check_output(self, cmd):
         '''Subclass subprocess.check_output() wrapper.
@@ -531,10 +528,7 @@ class ZephyrBinaryRunner(abc.ABC):
         self._log_cmd(cmd)
         if _DRY_RUN:
             return b''
-        try:
-            return subprocess.check_output(cmd)
-        except subprocess.CalledProcessError:
-            raise
+        return subprocess.check_output(cmd)
 
     def popen_ignore_int(self, cmd):
         '''Spawn a child command, ensuring it ignores SIGINT.