Revert "Integrate StreamManager with run_sweep() (#6233)"

[verult]

This reverts commit 86479ae.

Temporarily reverting the swap from unary to stream calls, since streaming is not yet ready on server side.

[codecov]

Codecov Report

Patch coverage: 100.0% and no project coverage change.

Comparison is base (c193c48) 97.3% compared to head (8dc206a) 97.3%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #6242   +/-   ##
======================================
  Coverage    97.3%   97.3%           
======================================
  Files        1116    1116           
  Lines       96174   96076   -98     
======================================
- Hits        93654   93564   -90     
+ Misses       2520    2512    -8     

Files Changed	Coverage Δ
cirq-core/cirq/circuits/circuit_operation_test.py	100.0% <ø> (+0.1%)	⬆️
...ristic_decompositions/two_qubit_gate_tabulation.py	100.0% <ø> (ø)
cirq-google/cirq_google/engine/engine_client.py	100.0% <ø> (ø)
cirq-google/cirq_google/engine/engine_job_test.py	100.0% <ø> (ø)
examples/bernstein_vazirani.py	97.0% <ø> (-0.2%)	⬇️
examples/deutsch.py	96.0% <ø> (-0.6%)	⬇️
examples/shor.py	100.0% <ø> (+4.8%)	⬆️
cirq-google/cirq_google/engine/engine.py	98.1% <100.0%> (-0.1%)	⬇️
...rq-google/cirq_google/engine/engine_client_test.py	100.0% <100.0%> (ø)
cirq-google/cirq_google/engine/engine_job.py	97.4% <100.0%> (+0.3%)	⬆️
... and 2 more

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