fix(jmx): fix regression in JMX auth connection failures

[andrewazores]

Welcome to Cryostat3! 👋

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Fixes: #438 See #350 See #424

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. Select vertx-fib-demo-2:9094 and go to Events. The JMX credentials modal should appear very quickly. Close the modal
3. Select cryostat3:9091. The JMX credentials modal should appear again. Enter the credentials cryostat:password. The modal should disappear and the table should load.
4. Re-select vertx-fib-demo-2:9094 and this time enter admin:adminpass123. The table should reload.

[andrewazores]

/build_test

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No OpenAPI schema changes detected.

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No GraphQL schema changes detected.

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CI build and push: All tests pass ✅ (JDK17) https://github.com/cryostatio/cryostat3/actions/runs/8971856299