refactor: remove legacy java frontend

[fuyufjh]

What's changed and what's your intention?

Merge #2519 again.

Remove legacy Java frontend, including sources and tests.

TO REVIEWERS: Click this link to see diffs excluding removing legacy folder -> https:/singularity-data/risingwave/pull/2519/files/2ef98f693fb42eeb1bf0df3facfa95549f4b35f2..HEAD

Some remaining works need to be done later:

• Check E2E test cases and make sure all cases are covered in v2/ before removing them
• Migrate regress tests src/tests/regress/ to Rust frontend and enable them
• Remove compatible code in backend (keyword: is_legacy_frontend)
• Remove CreateSourceExecutor
• Remove create_materialized_view and drop_materialized_view in StreamServiceImpl should we depracate StreamServiceImpl's usused functions? #2260
• Rename all occurrences of "FrontendV2" to "Frontend"

Checklist

N/A

Refer to a related PR or issue link (optional)

None

[codecov]

Codecov Report

Merging #2523 (0457bea) into main (e4a0c3a) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2523      +/-   ##
==========================================
+ Coverage   71.33%   71.40%   +0.06%     
==========================================
  Files         689      688       -1     
  Lines       88643    88531     -112     
==========================================
- Hits        63232    63213      -19     
+ Misses      25411    25318      -93     

Flag	Coverage Δ
rust	71.40% <ø> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/common/src/array/struct_array.rs	83.58% <0.00%> (-0.92%)	⬇️
src/risedevtool/src/task.rs	0.00% <0.00%> (ø)
src/risedevtool/src/config.rs	0.00% <0.00%> (ø)
src/frontend/src/binder/values.rs	92.68% <0.00%> (ø)
src/risedevtool/src/service_config.rs	0.00% <0.00%> (ø)
src/risedevtool/src/task/frontend_service.rs
src/risedevtool/src/bin/risedev-config.rs	0.44% <0.00%> (+0.01%)	⬆️
src/risedevtool/src/bin/risedev-compose.rs	1.12% <0.00%> (+0.01%)	⬆️
src/risedevtool/src/bin/risedev-playground.rs	0.30% <0.00%> (+0.01%)	⬆️
src/storage/src/hummock/local_version_manager.rs	89.88% <0.00%> (+0.03%)	⬆️
... and 2 more

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