Revert "Fix build with o2 defaults on slc9 (#5353)"

This reverts commit 5becd91.

datadistribution.sh

@@ -13,6 +13,7 @@ requires:
   - protobuf
   - O2
   - fmt
+  - "ucx:(slc8|slc9)"
 build_requires:
   - CMake
 source: https://github.com/AliceO2Group/DataDistribution

defaults-o2-dataflow.sh

@@ -51,20 +51,6 @@ overrides:
       BUILD_ANALYSIS: "OFF"   # Disable analysis in O2
       BUILD_EXAMPLES: "OFF"   # Disable examples in O2
       O2_BUILD_FOR_FLP: "ON"
-  DataDistribution:
-    requires:
-      - "GCC-Toolchain:(?!osx)"
-      - boost
-      - FairLogger
-      - libInfoLogger
-      - FairMQ
-      - Ppconsul
-      - grpc
-      - Monitoring
-      - protobuf
-      - O2
-      - fmt
-      - ucx   # this one added
 ---
 # This file is included in any build recipe and it's only used to set
 # environment variables. Which file to actually include can be defined by the

defaults-o2-epn.sh

@@ -40,20 +40,6 @@ overrides:
     requires:
       - lhapdf
       - boost
-  DataDistribution:
-    requires:
-      - "GCC-Toolchain:(?!osx)"
-      - boost
-      - FairLogger
-      - libInfoLogger
-      - FairMQ
-      - Ppconsul
-      - grpc
-      - Monitoring
-      - protobuf
-      - O2
-      - fmt
-      - ucx   # this one added
 ---
 # This file is included in any build recipe and it's only used to set
 # environment variables. Which file to actually include can be defined by the