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### _Why are the changes needed?_
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Generate Flink application names for per-job clusters and application-mode clusters with respect to the pattern in Spark engine.
This is a sub-task of KPIP-2 #1322.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1827 from link3280/KYUUBI-1825.
Closes#1825
c6670f9b [Paul Lin] [KYUUBI #1825] Remove `null` execution target case branch
1c093d68 [Paul Lin] [KYUUBI #1825] Set app name only if absent
ee2845f0 [Paul Lin] [KYUUBI #1825] Add the default branch for pattern matching
3d9e0928 [Paul Lin] [KYUUBI #1825] Generate appName for Flink applications
Authored-by: Paul Lin <paullin3280@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>
b47e1cdc8b