fix: drop interceptors:[] from vended cdk test fixture

The vended CDK project at src/assets/cdk/ runs against whichever
@aws/agentcore-cdk version the user installs from npm. Until the CDK
PR merges and publishes a new alpha, the registry version doesn't
declare `interceptors` on the project spec type — so the e2e job
fails with TS2353 when building the vended cdk/ project.

Drop the explicit `interceptors: []` from the test object literal.
Zod's default fills in `[]` at parse time when the new CDK ships, and
the field's absence is harmless in the meantime. The synth assertion
itself doesn't care about interceptors at all.

Snapshot updated to match.

Author: aidandaly24

src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap

@@ -404,7 +404,6 @@ test('AgentCoreStack synthesizes with empty spec', () => {
       agentCoreGateways: [],
       mcpRuntimeTools: [],
       unassignedTargets: [],
-      interceptors: [],
     },
   });
   const template = Template.fromStack(stack);

src/assets/cdk/test/cdk.test.ts

@@ -18,7 +18,6 @@ test('AgentCoreStack synthesizes with empty spec', () => {
       agentCoreGateways: [],
       mcpRuntimeTools: [],
       unassignedTargets: [],
-      interceptors: [],
     },
   });
   const template = Template.fromStack(stack);