grpc: revert #8278: Fix cardinality violations in non-server streaming RPCs

[arjan-bal]

Related issue: #7286

This reverts commit a64d933.

This change is breaking an internal test cl/774621745. A rollback is being performed to fix the broken test while we investigate the failure.

RELEASE NOTES: N/A

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.39%. Comparing base (bdbe6a2) to head (2db9aa5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
stream.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## master #8404 +/- ## ========================================== - Coverage 82.43% 82.39% -0.04%  ========================================== Files 413 413 Lines 40430 40424 -6 ========================================== - Hits 33328 33309 -19  - Misses 5751 5754 +3  - Partials 1351 1361 +10 

Files with missing lines	Coverage Δ
stream.go	81.65% <50.00%> (+0.15%)	⬆️

... and 18 files with indirect coverage changes

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