Migrate Beam Go to use the new Opaque Protocol Buffers

[lostluck]

See https://go.dev/blog/protobuf-opaque for details on Opaque Protocol Buffers for Go.

• genproto.sh has been updated to force generation of the Hybrid API, which is compatible with the new Opaque API.
  • This required updating the Go proto plug in, which now reserves comments properly, simplifying the script.
• The Go protocol buffers were regenerated. This yields the compatible APIs, such as accessor and setter methods and builder structs.
• The open2opaque migration tool was run, and the fewer than a dozen spots that required manual intervention were fixed.

This PR has no functional changes, and is almost entirely generated.

---

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[codecov]

Codecov Report

Attention: Patch coverage is 36.66818% with 1399 lines in your changes missing coverage. Please review.

Project coverage is 57.31%. Comparing base (9232cd8) to head (3a8a2b2).
Report is 30 commits behind head on master.

Files with missing lines	Patch %	Lines
...eam/model/jobmanagement_v1/beam_artifact_api.pb.go	33.65%	333 Missing and 8 partials ⚠️
...pkg/beam/model/jobmanagement_v1/beam_job_api.pb.go	36.94%	295 Missing and 2 partials ⚠️
sdks/go/pkg/beam/core/runtime/graphx/translate.go	30.08%	172 Missing ⚠️
...am/model/jobmanagement_v1/beam_expansion_api.pb.go	0.00%	135 Missing ⚠️
sdks/go/pkg/beam/core/runtime/harness/harness.go	0.00%	76 Missing ⚠️
...beam/model/fnexecution_v1/beam_provision_api.pb.go	28.43%	72 Missing and 1 partial ⚠️
sdks/go/pkg/beam/core/runtime/harness/statemgr.go	20.00%	71 Missing and 1 partial ⚠️
...odel/jobmanagement_v1/beam_artifact_api_grpc.pb.go	50.76%	28 Missing and 4 partials ⚠️
...eam/model/jobmanagement_v1/beam_job_api_grpc.pb.go	31.91%	31 Missing and 1 partial ⚠️
sdks/go/pkg/beam/artifact/materialize.go	58.06%	14 Missing and 12 partials ⚠️
... and 19 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #33434      +/-   ##
============================================
- Coverage     57.37%   57.31%   -0.06%     
  Complexity     1475     1475              
============================================
  Files           973      973              
  Lines        154905   157414    +2509     
  Branches       1076     1076              
============================================
+ Hits          88879    90225    +1346     
- Misses        63810    64948    +1138     
- Partials       2216     2241      +25     

Flag	Coverage Δ
go	35.26% <36.66%> (+0.59%)	⬆️

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