fix(tests): use valid list operators in Falco rule exception tests (#711)

Fixed `TestRuleFalcoWithExceptions` to comply with stricter validator
enforcement of list field operators.

The test was failing with validation error:
```
filter error: '=' operator not supported list filters.
Location: rule: TERRAFORM TEST ... - Attach to cluster-admin Role
```

This was caused by recent deployment of stricter validators that enforce
the use of compatible operators for list fields. List fields (like
`ka.req.binding.subjects`) must use compatible operators (`in`,
`exists`, `intersects`) rather than the `=` operator.

Author: rosenbloomb-sysdig

sysdig/resource_sysdig_secure_rule_falco_test.go

@@ -443,23 +443,12 @@ resource "sysdig_secure_rule_falco" "falco_rule_with_exceptions" {
    comps = ["in", "="]
    values = jsonencode([ [["sysdig", "sysdiglabs"], "falco"] ])
   }
-  exceptions {
-   name = "subjects_equal"
-   fields = ["ka.req.binding.subjects", "ka.req.binding.role"]
-   comps = ["=", "="]
-   values = jsonencode([ ["foo", "bar"] ])
-  }
   exceptions {
    name = "only_one_field"
    fields = ["ka.req.binding.subjects"]
    comps = ["in"]
    values = jsonencode([["foo"]])
   }
-  exceptions {
-   name = "only_one_field_without_comps"
-   fields = ["ka.req.binding.subjects"]
-   values = jsonencode([["foo"]])
-  }
 }
 `, name)
 }