EmulatorPkg: Temp remove IA32 GCC CI builds

EmulatorPkg: Temp remove IA32 GCC CI builds

EmulatorPkg IA32 GCC builds are not working due to a failure
to install the i386 library dependencies in Ubuntu 18.04.

Temporarily disable these specific CI tests until the issue
can be resolved.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>