Consider replacing usages of ConcurrentHashMap

[spericas]

Problem Description

ConcurrentHashMap is implemented using synchronized blocks. We recently found an issue that was causing some of our tests to hang due to the use of this class (see #8813). We should consider replacing usages of this class for our own maps and locks to avoid these problems.

Issues for each of the places that require additional analysis:

• Review ConcurrentHashMap usage in helidon-integration-cdi-jpa #8966
• Review ConcurrentHashMap usage in helidon-common-configurable #8967
• Review ConcurrentHashMap usage in helidon-messaing-kafka #8968
• Review ConcurrentHashMap usage in helidon-microprofile-jwt-auth #8969
• Review ConcurrentHashMap usage in helidon-microprofile-messaging #8970
• Review ConcurrentHashMap usage in helidon-microprofile-security #8971
• Review ConcurrentHashMap usage in helidon-security-providers-oidc  #8972
• Review ConcurrentHashMap usage in helidon-webserver-static-content #8973

[ljnelson]

Related: https://mail.openjdk.org/pipermail/loom-dev/2024-May/006632.html