[CI][Capnproto] Added Basic Regression Test with CAPNPROTO Disabled

There has been some regressions with regard to CAPNPROTO being disabled
since all of the CI tests have CAPNPROTO enabled.

Added a basic regression test to the CI which will run the vtr_reg_basic
tests with CAPNPROTO disabled. This will test both that everything
builds and basic VPR tests will run.

In the future we should test direct features that disabling CAPNPROTO
would affect (such as writing and reading routing files); however, for
now this will prevent the regressions previous seen.

.github/workflows/test.yml

@@ -197,6 +197,11 @@ jobs:
             params: '-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on -DVPR_USE_EZGL=off',
             suite: 'vtr_reg_basic'
           },
+          {
+            name: 'Basic with CAPNPROTO disabled',
+            params: '-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on -DVTR_ENABLE_CAPNPROTO=off',
+            suite: 'vtr_reg_basic'
+          },
           {
             name: 'Basic with VTR_ENABLE_DEBUG_LOGGING',
             params: '-DVTR_ASSERT_LEVEL=3 -DWITH_BLIFEXPLORER=on -DVTR_ENABLE_DEBUG_LOGGING=on',