JUnit5 assertThrows AbstractSubclassingProxyFactoryTestCase

[nhojpatrick]

Convert all legacy junit v4 exception checking to junit v5 assertThrows.

Test not run locally due to this error in master.

% mvn clean install
[INFO] Scanning for projects...
[ERROR] [ERROR] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='org.apache.commons:commons-proxy2-build-tools:2.1-SNAPSHOT'}' and 'Vertex{label='org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT'}' introduces to cycle in the graph org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT --> org.apache.commons:commons-proxy2-build-tools:2.1-SNAPSHOT --> org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT @ 
[ERROR] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='org.apache.commons:commons-proxy2-build-tools:2.1-SNAPSHOT'}' and 'Vertex{label='org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT'}' introduces to cycle in the graph org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT --> org.apache.commons:commons-proxy2-build-tools:2.1-SNAPSHOT --> org.apache.commons:commons-proxy2-parent:2.1-SNAPSHOT -> [Help 1]