Chore: [AEA-5803] - remove old secrets policy (#2534)

## Summary

- 🤖 Operational or Infrastructure Change
- 
### Details

Remove the old secrets policy in account resources now that we have
locally managed secrets.

Author: tstephen-nhs

.github/workflows/run_regression_tests.yml

@@ -75,11 +75,11 @@ jobs:
         run: |
           if [[ "$TARGET_ENVIRONMENT" != "prod" && "$TARGET_ENVIRONMENT" != "ref" ]]; then
             # this should be the tag of the tests you want to run
-            REGRESSION_TEST_REPO_TAG=v3.3.1
+            REGRESSION_TEST_REPO_TAG=v3.6.2
 
             # this should be the tag of the regression test workflow you want to run
             # This will normally be the same as REGRESSION_TEST_REPO_TAG
-            REGRESSION_TEST_WORKFLOW_TAG=v3.3.1
+            REGRESSION_TEST_WORKFLOW_TAG=v3.6.2
 
             curl https://raw.githubusercontent.com/NHSDigital/electronic-prescription-service-api-regression-tests/refs/tags/${REGRESSION_TEST_WORKFLOW_TAG}/scripts/run_regression_tests.py -o run_regression_tests.py
             poetry install

SAMtemplates/functions/lambda_resources.yaml

@@ -83,7 +83,6 @@ Resources:
             - !ImportValue lambda-resources:LambdaInsightsLogGroupPolicy
             - !ImportValue account-resources:CloudwatchEncryptionKMSPolicyArn
             - !ImportValue account-resources:LambdaDecryptSecretsKMSPolicy
-            - !ImportValue secrets:GetNotifySecretsManagedPolicy
             - !If
               - ShouldIncludeAdditionalPolicies
               - !Join