[cmd/mdatagen] optimize mdatagen for batchprocessor failed test

[fatsheep9146]

Description:
fix #9688

The batchprocessor use a batchProcessor as a common struct which implements consumer.Traces, consumer.Metrics, consumer.Logs in the meantime.

As a result, the generated lifecycle test will fail, since when it create a metrics, traces processor object, it will still fall to the case consumer.Logs and panic.

=== RUN   TestComponentLifecycle/metrics-shutdown
=== RUN   TestComponentLifecycle/metrics-lifecycle
panic: interface conversion: interface {} is plog.Logs, not pmetric.Metrics

goroutine 37 [running]:
go.opentelemetry.io/collector/processor/batchprocessor.(*batchMetrics).add(0x14000208120?, {0x10572aae0?, 0x1400029c3f0?})
	/Users/zhaoziqi/Documents/go/src/go.opentelemetry.io/opentelemetry-collector/processor/batchprocessor/batch_processor.go:450 +0x208
go.opentelemetry.io/collector/processor/batchprocessor.(*shard).processItem(0x14000292200, {0x10572aae0?, 0x1400029c3f0?})
	/Users/zhaoziqi/Documents/go/src/go.opentelemetry.io/opentelemetry-collector/processor/batchprocessor/batch_processor.go:226 +0x38
go.opentelemetry.io/collector/processor/batchprocessor.(*shard).start(0x14000292200)
	/Users/zhaoziqi/Documents/go/src/go.opentelemetry.io/opentelemetry-collector/processor/batchprocessor/batch_processor.go:199 +0x1a0
created by go.opentelemetry.io/collector/processor/batchprocessor.(*batchProcessor).newShard in goroutine 36
	/Users/zhaoziqi/Documents/go/src/go.opentelemetry.io/opentelemetry-collector/processor/batchprocessor/batch_processor.go:160 +0x1a4
exit status 2
FAIL	go.opentelemetry.io/collector/processor/batchprocessor	0.594s

Link to tracking Issue:
fix #9688

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.98%. Comparing base (ef9caab) to head (78da03c).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9768      +/-   ##
==========================================
+ Coverage   90.96%   90.98%   +0.02%     
==========================================
  Files         353      353              
  Lines       18630    18621       -9     
==========================================
- Hits        16947    16943       -4     
+ Misses       1356     1352       -4     
+ Partials      327      326       -1     

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[dmitryax]

Thanks @fatsheep9146! Can you please update contrib as well?

[fatsheep9146]

Thanks @fatsheep9146! Can you please update contrib as well?

No problem! I will do this ASAP. @dmitryax

[fatsheep9146]

Thanks @fatsheep9146! Can you please update contrib as well?

@dmitryax Contrib will be updated by open-telemetry/opentelemetry-collector-contrib#31778