actuator health endpoint should not require authN

[gberche-orange]

Expected behavior

• as a coab user
• in order to scrape the health endpoint easily and security
• I need to connect without authentication (since no confidential data is served from the health endpoint)

Observed behavior

curl https://coa-noop-broker.redacted-domain.org/actuator/health
{"timestamp":"2021-06-11T10:26:55.646+00:00","status":401,"error":"Unauthorized","message":"","path":"/actuator/health"}