chore: delete java dir from gitignore

[zjx1319]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Delete java dir from /hybridse/.gitignore

• What is the current behavior? (You can also link to an open issue here)

Issue: #1531

• What is the new behavior (if this is a feature change)?

N/A.

[github-actions]

SDK Test Report

  73 files    73 suites   6m 31s ⏱️
174 tests 171 ✔️ 3 💤 0 ❌
215 runs  212 ✔️ 3 💤 0 ❌

Results for commit 91411cb.

[github-actions]

HybridSE Linux Test Report

       66 files       234 suites   5m 30s ⏱️
18 927 tests 18 925 ✔️ 2 💤 0 ❌

Results for commit 91411cb.

[github-actions]

HybridSE Mac Test Report

       66 files       234 suites   6m 45s ⏱️
18 927 tests 18 925 ✔️ 2 💤 0 ❌

Results for commit 91411cb.

[github-actions]

Linux Test Report

       57 files       186 suites   1h 3m 54s ⏱️
  8 397 tests   8 389 ✔️ 8 💤 0 ❌
12 313 runs  12 305 ✔️ 8 💤 0 ❌

Results for commit 91411cb.

[codecov]

Codecov Report

Merging #1743 (91411cb) into main (efdb71e) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1743      +/-   ##
============================================
- Coverage     73.58%   73.55%   -0.03%     
  Complexity      347      347              
============================================
  Files           613      613              
  Lines        119851   119851              
  Branches       1010     1010              
============================================
- Hits          88187    88154      -33     
- Misses        31455    31488      +33     
  Partials        209      209              

Impacted Files	Coverage Δ
...s/query_response_time/deploy_query_response_time.h	81.25% <0.00%> (-18.75%)	⬇️
...atistics/query_response_time/query_response_time.h	78.26% <0.00%> (-4.35%)	⬇️
src/sdk/db_sdk.cc	62.13% <0.00%> (-3.86%)	⬇️
.../query_response_time/deploy_query_response_time.cc	97.10% <0.00%> (-2.90%)	⬇️
src/zk/dist_lock.cc	81.81% <0.00%> (-1.52%)	⬇️
src/rpc/rpc_client.h	89.18% <0.00%> (-1.36%)	⬇️
hybridse/src/udf/udf_library.cc	81.46% <0.00%> (-0.44%)	⬇️
src/tablet/tablet_impl.cc	58.75% <0.00%> (-0.27%)	⬇️
src/nameserver/name_server_impl.cc	42.23% <0.00%> (-0.05%)	⬇️
src/storage/mem_table.cc	89.26% <0.00%> (+0.13%)	⬆️
... and 2 more

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