fix: wrong context passing into NewClient, error handling lost in session_util

[chyezh]

issue: #30799
pr: #30817

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.15%. Comparing base (2896f5e) to head (69af00f).
Report is 3 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #30818      +/-   ##
==========================================
+ Coverage   82.11%   82.15%   +0.03%     
==========================================
  Files         841      841              
  Lines      122006   121402     -604     
==========================================
- Hits       100190    99739     -451     
+ Misses      18588    18423     -165     
- Partials     3228     3240      +12     

Files	Coverage Δ
internal/util/grpcclient/client.go	84.21% <100.00%> (+0.26%)	⬆️
internal/querynodev2/server.go	72.09% <0.00%> (ø)

... and 112 files with indirect coverage changes

[chyezh]

rerun ut

[mergify]

@chyezh E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[mergify]

@chyezh E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[chyezh]

/run-cpu-e2e

[jaime0815]

/lgtm

[xiaofan-luan]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chyezh, xiaofan-luan

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