.pytool/Plugin/EccCheck: Remove temp directory on exception

.pytool/Plugin/EccCheck: Remove temp directory on exception

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2986

Add try/except to RunBuildPlugin() to remove temporary
directory if a KeyboardInterrupt exception or an unexpected
exception is detected.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Sean Brogan <sean.brogan@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>