Try to build the conda flavors without freeze install and pinning transitive dependencies

[tkilias]

Background

• We are currently facing an issue with the transitive dependency conflicts on the packages harfbuzz and icu.
• The direct dependencies Rapids and OpenJDK need different version, but OpenJDK actually is only used in the build_run step and won't be included into the final container
• Under the assumption that we define and pin all direct dependencies, we probably don't need to care about, if parallel build steps which never join again use different transitive dependencies
• This means we could try to disable freeze install, remove all pinning of transitive dependencies and give conda more flexibility during the selection of the package versions.

Acceptance Criteria

• Remove pinned transitive dependencies
• Make sure all direct dependencies are pinned
• Add option to disable freeze-install
• Make sure the container still work