fix(common): use original options when resuming streaming RPCs

[coryan]

From the discussion on #8355 (comment)

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This change is 

[google-cloud-cpp-bot]

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[codecov]

Codecov Report

Merging #8404 (f74c2af) into main (d6e0897) will decrease coverage by 0.00%.
The diff coverage is 84.00%.

@@            Coverage Diff             @@
##             main    #8404      +/-   ##
==========================================
- Coverage   95.04%   95.03%   -0.01%     
==========================================
  Files        1363     1363              
  Lines      121304   121328      +24     
==========================================
+ Hits       115290   115306      +16     
- Misses       6014     6022       +8     

Impacted Files	Coverage Δ
...ogle/cloud/internal/resumable_streaming_read_rpc.h	85.71% <33.33%> (-6.18%)	⬇️
...loud/internal/resumable_streaming_read_rpc_test.cc	91.25% <100.00%> (+1.01%)	⬆️
...e/cloud/spanner/testing/cleanup_stale_instances.cc	48.38% <0.00%> (-12.91%)	⬇️
...ud/spanner/integration_tests/client_stress_test.cc	85.52% <0.00%> (-0.66%)	⬇️
.../cloud/storage/benchmarks/throughput_experiment.cc	74.37% <0.00%> (-0.51%)	⬇️
google/cloud/pubsub/samples/samples.cc	92.02% <0.00%> (-0.24%)	⬇️
...cloud/pubsub/internal/subscription_session_test.cc	98.00% <0.00%> (+0.24%)	⬆️
google/cloud/bigtable/async_read_stream_test.cc	97.99% <0.00%> (+0.66%)	⬆️

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[devbww]

I was thinking about google::cloud::internal::ResumableStreamingReadRpc<>, I just created #8404, you can tell me there if the changes are not needed.

No, I don't think these changes are needed. That is, these new OptionsSpans are redundant, and we probably should avoid creating them, if only for performance reasons. It is also nice to have the span stuff all in one place, and as close to the user as possible.

In this case, a ResumableStreamingReadRpc is always immediately transferred into a StreamReader<T> functor, and that is then moved into a StreamRange<T> via MakeStreamRange<T>(). From there, the reader is only ever invoked/destroyed under the restored options, as the user handles the StreamRange<T>, due to the changes already made to google/cloud/stream_range.h.

[coryan]

Thanks for looking into it.