radeonsi/ci: run GLCTS, ESCTS, and dEQP from the glcts directory, update failures
GLCTS contains more recent dEQP, so we can remove the deqp clone.
Changes:
- glcts should use the main branch
- glcts/build contains gl-cts and deqp
- glcts/build_es contains gles-cts
- remove the escts and deqp directories and paths
- it saves about 27 GB of disk space
Updated build instructions: https://github.com/marekolsak/marek-build/