fix(cloudfront): Cache Policy headers enforce soft limit of 10 (#13904)

Validation was added in #13425 to enforce a limit of the number of headers
allowed in the allow list for a Cache Policy; that limit is a soft limit and
should not be hard-enforced in code.

fixes #13903

This reverts commit e08213f.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-cloudfront/lib/cache-policy.ts

@@ -231,9 +231,6 @@ export class CacheHeaderBehavior {
     if (headers.length === 0) {
       throw new Error('At least one header to allow must be provided');
     }
-    if (headers.length > 10) {
-      throw new Error(`Maximum allowed headers in Cache Policy is 10; got ${headers.length}.`);
-    }
     return new CacheHeaderBehavior('whitelist', headers);
   }
 

packages/@aws-cdk/aws-cloudfront/test/cache-policy.test.ts

@@ -96,17 +96,6 @@ describe('CachePolicy', () => {
     expect(() => new CachePolicy(stack, 'CachePolicy6', { cachePolicyName: 'My_Policy' })).not.toThrow();
   });
 
-  test('throws if more than 10 CacheHeaderBehavior headers are being passed', () => {
-    const errorMessage = /Maximum allowed headers in Cache Policy is 10; got (.*?)/;
-    expect(() => new CachePolicy(stack, 'CachePolicy1', {
-      headerBehavior: CacheHeaderBehavior.allowList('Lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur', 'adipiscing', 'elit', 'sed', 'do', 'eiusmod'),
-    })).toThrow(errorMessage);
-
-    expect(() => new CachePolicy(stack, 'CachePolicy2', {
-      headerBehavior: CacheHeaderBehavior.allowList('Lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur', 'adipiscing', 'elit', 'sed', 'do'),
-    })).not.toThrow();
-  });
-
   test('does not throw if cachePolicyName is a token', () => {
     expect(() => new CachePolicy(stack, 'CachePolicy', {
       cachePolicyName: Aws.STACK_NAME,