Automatic delete generated files with pdatagen before re-generate

[bogdandrutu]

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Component(s)

pdata

What happened?

Avoid problems like https://github.com/open-telemetry/opentelemetry-collector/pull/14073

Collector version

v0.138.0

Environment information

Environment

OS: (e.g., "Ubuntu 20.04") Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

Log output

Additional context

No response

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