operator: remove unnecessary check in op_controller

[lhy1024]

Signed-off-by: lhy1024 admin@liudos.us

What problem does this PR solve?

It is unnecessary to check in NewUnfinishedOpInfluence and GetOpInfluence

Check List

Tests

• Unit test

[codecov-io]

Codecov Report

Merging #1882 into master will decrease coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1882      +/-   ##
==========================================
- Coverage   77.42%   77.39%   -0.04%     
==========================================
  Files         164      164              
  Lines       16586    16578       -8     
==========================================
- Hits        12842    12830      -12     
  Misses       2730     2730              
- Partials     1014     1018       +4

Impacted Files	Coverage Δ
server/schedule/operator_controller.go	91.07% <100%> (-0.16%)	⬇️
server/schedule/operator/operator.go	86.94% <100%> (+0.52%)	⬆️
server/kv/etcd_kv.go	72.72% <0%> (-9.1%)	⬇️
pkg/etcdutil/etcdutil.go	82.6% <0%> (-5.8%)	⬇️
server/tso/tso.go	76.11% <0%> (-3.74%)	⬇️
server/member/leader.go	76.53% <0%> (-2.05%)	⬇️
server/heartbeat_streams.go	69% <0%> (-1%)	⬇️
server/server.go	82.43% <0%> (-0.62%)	⬇️
server/grpc_service.go	59.05% <0%> (+1.29%)	⬆️
... and 2 more

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[shafreeck]

LGTM

[rleungx]

LGTM.

[lhy1024]

/merge

[sre-bot]

/run-all-tests