Prepare bringing testcase execution time to TM (otf-micronaut-java-toolkit)

This is a child issue to https://gitlab.com/henixdevelopment/squash/squash-tm/core/squashtest-tm-staging/-/issues/1320

I think we should add the execution time somewhere in the class: ReportInterpreterOutput

and class ReportInterpreterOutputBuilder

https://gitlab.com/henixdevelopment/open-source/opentestfactory/micronaut-java-toolkit/-/blob/main/otf-report-interpreter-base/src/main/java/org/opentestfactory/report/interpreter/base/application/report/ReportInterpreterOutputBuilder.java?ref_type=heads