refactor: remove unused code in SimpleResultSet

[IZUMI-Zu]

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

  remove unused code in SimpleResultSet

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

  Issue remove unused code in SimpleResultSet #1760

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

[github-actions]

SDK Test Report

  74 files    74 suites   7m 49s ⏱️
175 tests 172 ✔️ 3 💤 0 ❌
216 runs  213 ✔️ 3 💤 0 ❌

Results for commit 7fd0bd8.

[github-actions]

Linux Test Report

       57 files       186 suites   1h 6m 51s ⏱️
  8 472 tests   8 464 ✔️ 8 💤 0 ❌
12 423 runs  12 415 ✔️ 8 💤 0 ❌

Results for commit 7fd0bd8.

[codecov]

Codecov Report

Merging #1810 (7fd0bd8) into main (56203b9) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1810      +/-   ##
============================================
- Coverage     73.75%   73.73%   -0.02%     
  Complexity      347      347              
============================================
  Files           614      614              
  Lines        120318   120318              
  Branches       1015     1015              
============================================
- Hits          88740    88721      -19     
- Misses        31369    31388      +19     
  Partials        209      209              

Impacted Files	Coverage Δ
.../com/_4paradigm/openmldb/jdbc/SimpleResultSet.java	7.35% <ø> (ø)
...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%)	⬇️
.../query_response_time/deploy_query_response_time.cc	97.10% <0.00%> (-2.90%)	⬇️
src/sdk/db_sdk.cc	61.67% <0.00%> (-1.37%)	⬇️
src/rpc/rpc_client.h	89.18% <0.00%> (-1.36%)	⬇️
src/replica/log_replicator.cc	81.87% <0.00%> (-0.33%)	⬇️
src/catalog/client_manager.cc	42.20% <0.00%> (-0.29%)	⬇️
src/nameserver/name_server_impl.cc	42.63% <0.00%> (-0.21%)	⬇️
src/client/ns_client.cc	46.80% <0.00%> (-0.15%)	⬇️
... and 4 more

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