Mingyu Chen
5d2758cb8f
[improvement](build) move add BE extension jars to java_extensions dir (#20740)
Follow #20185
Move all BE java extension jars to `be/lib/java_extensions/` dir.
Also remove `udf` dir, used for BE native udf, which is deprecated since v1.2
The final output is:
```
output
├── be
│ ├── bin
│ ├── conf
│ ├── dict
│ ├── lib
| ├── java_extensions
│ ├── hudi-scanner-jar-with-dependencies.jar
│ ├── java-udf-jar-with-dependencies.jar
│ ├── jdbc-scanner-jar-with-dependencies.jar
│ ├── max-compute-scanner-jar-with-dependencies.jar
│ └── paimon-scanner-jar-with-dependencies.jar
│ ├── LICENSE-dist.txt
│ ├── licenses
│ ├── log
│ ├── NOTICE.txt
│ ├── storage
│ └── www
└── fe
├── bin
├── conf
├── doris-meta
├── lib
├── LICENSE-dist.txt
├── licenses
├── log
├── mysql_ssl_default_certificate
├── NOTICE.txt
├── spark-dpp
└── webroot
```