chore: remove upload scripts (#1129)

Author: dervoeti

.scripts/upload_new_kcat_version.sh

@@ -4,27 +4,8 @@ As of SDP 24.7 we do include HBase 2.6 support in an experimental state.
 
 ## Phoenix
 
-At the time of this writing (July 12, 2024) there is no Phoenix release that supports HBase 2.6 so the script `upload_new_phoenix_version.sh` will not work.
-
-HBase 2.6 support [was added](https://github.com/apache/phoenix/pull/1793) with [PHOENIX-7172](https://issues.apache.org/jira/browse/PHOENIX-7172).
-SDP 24.7 includes Phoenix built from the master branch from commit [4afe457](https://github.com/apache/phoenix/tree/4afe4579bb3ab01725e4939746d0b7b807b438ac).
-
-```bash
-# clone the Phoenix repo
-git clone [email protected]:apache/phoenix.git
-cd phoenix
-git checkout 4afe457
-
-# create a tarball
-mkdir ../phoenix-5.3.0-4afe457
-git archive --format=tar --output ../phoenix-5.3.0-4afe457/phoenix.tar 4afe457
-cd ../phoenix-5.3.0-4afe457
-tar xf phoenix.tar
-rm phoenix.tar
-echo 4afe457 > git-commit
-cd ..
-tar -c phoenix-5.3.0-4afe457 | gzip > phoenix-5.3.0-4afe457-src.tar.gz
-```
+HBase 2.6 support [was added](https://github.com/apache/phoenix/pull/1793) with [PHOENIX-7172](https://issues.apache.org/jira/browse/PHOENIX-7172) and released with Phoenix 5.2.1, which is included since SDP 25.3.
+SDP 24.7 included Phoenix built from the master branch from commit [4afe457](https://github.com/apache/phoenix/tree/4afe4579bb3ab01725e4939746d0b7b807b438ac).
 
 ## HBase operator tools