AthDerivation: delete obsolete project

We do not use the AthDerivation project anymore in main. Derivations are produced with the full Athena project. If needed the project can be restored from git history.

This merge request affects 1 package:

• Projects/AthDerivation

This merge request affects 12 files:

• Projects/AthDerivation/CMakeGraphVizOptions.cmake
• Projects/AthDerivation/CMakeLists.txt
• Projects/AthDerivation/README.md
• Projects/AthDerivation/build.sh
• Projects/AthDerivation/build_env.sh
• Projects/AthDerivation/build_externals.sh
• Projects/AthDerivation/cmake/PostConfig.cmake.in
• Projects/AthDerivation/cmake/PreConfig.cmake.in
• Projects/AthDerivation/cmake/README.txt.in
• Projects/AthDerivation/externals.txt
• Projects/AthDerivation/package_filters.txt
• Projects/AthDerivation/version.txt

Adding @akraszna as watcher

added Build main review-pending-level-1 labels

CI Result SUCCESS (hash 03dedf8e)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 79267]

The deletion is straightforward and there are no issues with the CI. Approving from L1.

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 71517797

added sweep:ignore label