add explicit token duration config for both JWTs (#1698)

<!-- please choose -->
- Enhancement

- Add explicit token duration (60 min) over default 60 min

- #1682

Please answer the questions below briefly where applicable, or write
`N/A`. Based on
[OWASP 10](https://owasp.org/Top10/en/).

- Does this PR introduce or modify any input fields or queries - this
includes
fetching data from storage outside the application (e.g. a database, an
S3 bucket)?
  - Is the input sanitized?
- What precautions are you taking before deserializing the data you
consume?
  - Is injection prevented by parametrizing queries?
  - Have you ensured no `eval` or similar functions are used?
- Does this PR introduce any functionality or component that requires
authorization?
- How have you ensured it respects the existing AuthN/AuthZ mechanisms?
  - Are you logging failed auth attempts?
- Are you using or adding any cryptographic features?
  - Do you use a standard proven implementations?
  - Are the used keys controlled by the customer? Where are they stored?
- Are you introducing any new policies/roles/users?
  - Have you used the least-privilege principle? How?

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

deploy/stacks/cognito.py

@@ -21,6 +21,7 @@
 from .pyNestedStack import pyNestedClass
 from .solution_bundling import SolutionBundling
 from .waf_rules import get_waf_rules
+from .iam_utils import get_tooling_account_external_id
 
 
 class IdpStack(pyNestedClass):
@@ -99,13 +100,16 @@ def __init__(
                 domain_prefix=f"{resource_prefix.replace('-', '')}{envname}{self.region.replace('-', '')}{self.account}"
             ),
         )
+        jwt_token_duration = 180 if with_approval_tests else 60
         self.client = cognito.UserPoolClient(
             self,
             f'AppClient-{envname}',
             user_pool=self.user_pool,
             auth_flows=AuthFlow(user_password=with_approval_tests, user_srp=True, custom=True),
             prevent_user_existence_errors=True,
             refresh_token_validity=Duration.minutes(cognito_user_session_timeout_inmins),
+            id_token_validity=Duration.minutes(jwt_token_duration),
+            access_token_validity=Duration.minutes(jwt_token_duration),
         )
 
         if enable_cw_rum:
@@ -198,6 +202,7 @@ def __init__(
             f'{resource_prefix}-{envname}-cognito-config-role',
             role_name=f'{resource_prefix}-{envname}-cognito-config-role',
             assumed_by=iam.AccountPrincipal(tooling_account_id),
+            external_ids=[get_tooling_account_external_id(self.account)],
         )
         cross_account_frontend_config_role.add_to_policy(
             iam.PolicyStatement(