Add ability to add ear lib to appclient classpath

[starksm64]

Fixes Issue
#1650

Describe the change
This adds a ${clientEarLibClasspath} variable that can be added to the appclient arquillian.xml in either the clientCmdLineString or clientEnvString appclient protocol configuration settings.

Additional context

with this change the com.sun.ts.tests.assembly.classpath.appclient.Client passes:

starksm@Scotts-Mac-Studio assembly-tck % mvn -Dit.test=com.sun.ts.tests.assembly.classpath.appclient.Client integration-test
[INFO] Cache configuration is not available at configured path /Users/starksm/Dev/Jakarta/platform-tck/.mvn/maven-build-cache-config.xml, cache is enabled with defaults
[INFO] Using XX hash algorithm for cache
[INFO] Scanning for projects...
...
[INFO] 
[INFO] Results:
[INFO] 
[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0

There still are several other failures.

CC @alwin-joseph @anajosep @arjantijms @cesarhernandezgt @dblevins @m0mus @edbratt @gurunrao @jansupol @jgallimore @kazumura @kwsutter @LanceAndersen @bhatpmk @RohitKumarJain @shighbar @gthoman @brideck @OndroMih @dmatej
@starksm64 @scottmarlow