Adding tests for cel expressions demonstrating use of has

[jmcshane]

I was reading through this test to get a handle for the type of expressions I could
use in overlays and filter expressions and noticed that there weren't any tests
demonstrating the capabilities discussed in #890.

This change adds two tests within the existing structure of the cel_test to help
this file be used as a place to go for example expressions that should work or,
alternative, fail.

Changes

Adding some more complex expressions in cel_test

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[dibyom]

/ok-to-test

[dibyom]

/approve

/cc @bigkevmcd

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[bigkevmcd]

/lgtm

I turn to the tests whenever I get an odd CEL query, so makes sense to me.