doc: Add howto documentation for Jira Xray for Tractus X

[ds-sdileo]

This PR adds documentation how to work with test assets in Xray for Jira for the test management board https://catena-x.atlassian.net/jira/software/c/projects/CXTPM/issues

[stephanbcbauer]

Is this still planned for 25.09? 25.12?

[ds-sdileo]

@stephanbcbauer I fixed the lint errors. Could you please recheck?

[ds-hzimmer]

Topic added to board in committer meeting 10.10. Tractus-X Open Meetings (view)

[ds-hzimmer]

Dear @stephanbcbauer @matbmoser or other Tractus-X Committers, could you please review the contents of the pull request and check where these "How-To" Test Management Tutorials should be published so they are also publicly accessible to interested parties, e.g. in https://eclipse-tractusx.github.io/docs/tutorials oar alternatively in a new section in the Developer Hub documentation.

[matbmoser]

Use the "REUSE.toml" for specify the license of the screenshots.

[ds-hzimmer]

Added patch and draft pull request to include a notice and authors section regarding licensing information for the screenshots to docs/oss/howto-xray.md. ds-sdileo/eclipse-tractusx.github.io@howto-xray...ds-hzimmer:eclipse-tractusx.github.io:patch-4
But will probably have difficulty merging it as ds-sdileo is no longer available to approve commit/pull request.