feat: capture hostname field from JUnit XML test suites

[rhopp]

Summary

Adds tracking of hostname property of junit files.

This is required, because Playwright junit reporter populates this field with what's called Project in Playwright. This field contains important information for us (it basically contains currently tested configuration)

Example of such xunit file:

<testsuites id="" name="" tests="18" failures="1" skipped="4" errors="0" time="1105.067546">
<testsuite name="tssc/full_workflow.test.ts" timestamp="2026-01-16T11:02:39.362Z" hostname="e2e-go[github-tekton-quay-local]" tests="6" failures="1" skipped="4" time="151.114" errors="0">
<testcase name="TSSC Complete Workflow › Component Creation › should create a component successfully" classname="tssc/full_workflow.test.ts" time="45.914">
<system-out>
...

Other Information

Any other information that is important to this PR.

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[rhopp]

@flacatus I'm not sure how to properly test this locally, so this PR is sadly untested. Feel free to return this back to me if needed.