docs(gooddata-eval): add LICENSE.txt with FOSSA attribution report

MIT license header plus the FOSSA-generated dependency attribution
report (2026-6-3), matching the LICENSE.txt convention of the other
packages. The raw FOSSA report embedded the entire gooddata-sdk
LICENSE.txt (itself a full 2024 attribution report) twice -- once in
the gooddata-sdk package section and once more in the license-text
appendix -- so the duplicated appendix copy was removed (~78 KB); the
full text remains in the gooddata-sdk section.

jira: GDAI-1766
risk: nonprod

Author: hkad98