SPI-2445: add protobuf2 package with old protobuf version for ATLAS NSW

To run the testing, add a comment with:

Bot test PACKAGE[ PACKAGE2 ...]|all in TOOLCHAIN|all [(only|also) for LABEL-COMPILER-BUILDTYPE] please!

To ensure patches required for existing LCG branches are not lost, please add the respective labels: alsoTargeting:LCG_102-patches, alsoTargeting:master, etc.

cmake/scripts/create_lcg_view.py

@@ -484,7 +484,9 @@ This package creates a "view" of LCG release in folder <view_destination>.
                          'powheg-box', 'sherpa-mpich2',
                          'sherpa-openmpi', 'Qt6', 'qt6', 'Geant4-vecgeom-scalar',
                          'pyanalysis', 'pytools', 'pygraphics', 'PythonFWK',
-                         'GraalVM']
+                         'GraalVM',
+                         'protobuf2',
+                         ]
     else:
         blacklist = ['version.txt']
         greylist = []