test-mgmt-hub.sh also fails

Once issue All-in-one installer now fails. #218 was addressed and the all-in-one installer successfully completes, the test-mgmt-hub.sh script now fails:

2025-10-22 12:28:40 sudo EXCHANGE_USER_ORG=MyUserOrg HZN_LISTEN_IP=192.168.10.3 ./deploy-mgmt-hub.sh 
------- Checking input and initializing ...                                                                                                                                                             
Management hub services will listen on http://192.168.10.3                                          
Updating packages...                                                                                                                                                                                    

then (with appropriate environment symbols set):

2025-10-22 12:31:21 sudo -E ./test-mgmt-hub.sh
testMgmtHubServices
testDefaultsFile
testAgent
testEdgeService
testExchangeHubAdmin
ASSERT:
ASSERT:expected:<test-mgmt-hub-org> but was:<null>
ASSERT:expected:<test-mgmt-hub-org> but was:<null>
testExchangeSystemOrg
ASSERT:expected:<MyUserOrg> but was:<null>
testExchangeUserOrg
testMms

Ran 8 tests.

FAILED (failures=4)

As with issue 218, the following work-around (applied to the installation script invocation) reverting to a prior version of the exchange-api container image applies:

export EXCHANGE_IMAGE_TAG=2.151.0-testing