Merge branch 'VT-70-function-Migrate-Spack-env-setup-into-ESD-repo-with-buildcache' into VT-87-Enabling-coverage-report-for-the-dedal-respository

# Conflicts:
#	.gitlab-ci.yml
#	README.md

# Conflicts:
#	dedal/cli/SpackManager.py
#	dedal/spack_factory/SpackOperation.py
#	dedal/spack_factory/SpackOperationUseCache.py
#	dedal/utils/bootstrap.sh
#	pyproject.toml

Revert "- Added a 10 minute timeout for testing if any specific command hangs on subprocess.run command!"

This reverts commit 92f210b5.

Revert "- Added a 10 minute timeout for testing if any specific command hangs on subprocess.run command!"

This reverts commit ca24dca8.

This reverts commit e0262adc.

- coverage combine cannot process Cobertura files. Therefore, merge the .coverage folder individually to prevent failures when combining the coverage results.

- Fixed the failing merge_coverage job by ensuring the required coverage package is installed. Moved the common before_script to the default section.
- Added the test coverage badge to README.md.

Merge remote-tracking branch 'origin/esd-spack-installation' into VT-70-function-Migrate-Spack-env-setup-into-ESD-repo-with-buildcache

# Conflicts:
#	README.md

Merge branch 'esd-spack-installation' into VT-70-function-Migrate-Spack-env-setup-into-ESD-repo-with-buildcache