[ddc] Skipping js_interop_generic_cast_test

This avoids the following error on dart2js bots:

EvalError: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self'".
Change-Id: I8db11022547566706ced612af86146b7731c35c0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/397980
Auto-Submit: Mark Zhou <[email protected]>
Reviewed-by: Nicholas Shahan <[email protected]>
Commit-Queue: Nicholas Shahan <[email protected]>

Author: Markzipan

tests/web/web.status

@@ -42,6 +42,7 @@ consistent_index_error_string_test: Slow, Pass # Issue 25940
 [ $compiler == dart2js && $csp ]
 deferred_fail_and_retry_test: SkipByDesign # Uses eval to simulate failed loading.
 internal/object_members_test: SkipByDesign # Uses eval for interop
+js_interop_generic_cast_test: SkipByDesign # Issue 42085. CSP policy disallows injected JS code
 js_interop_non_null_asserts_disabled_test: SkipByDesign # Issue 42085. CSP policy disallows injected JS code
 js_interop_non_null_asserts_enabled_test: SkipByDesign # Issue 42085. CSP policy disallows injected JS code
 regress/issue/49129_test: SkipByDesign # Uses eval for interop