tracing: Remove trace mode and trace type

Remove the `trace_mode` and `trace_type` agent tracing options as
decided in the Architecture Committee meeting.

See:

- https://github.com/kata-containers/kata-containers/pull/2062

Fixes: #2352.

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>

src/runtime/pkg/katautils/config_test.go

@@ -1152,9 +1152,6 @@ func TestAgentDefaults(t *testing.T) {
 
 	a.Tracing = true
 	assert.Equal(a.trace(), a.Tracing)
-
-	assert.Equal(a.traceMode(), a.TraceMode)
-	assert.Equal(a.traceType(), a.TraceType)
 }
 
 func TestGetDefaultConfigFilePaths(t *testing.T) {