[GCP] Remove lightweight module in gcp.billing data stream

[endorama]

Part of #3188

• For the migrated data streams (from Beats): we should move the configuration part from Beats into integrations.
• For all data streams: use ingest pipeline instead of rename processor.

[legoguy1000]

IDK if this will be possible since this isn't a lightweight module (at least from my understanding) its custom go code to query BigQuery.

[kaiyan-sheng]

Yeah we probably should close this issue @endorama :)

[endorama]

Yes, I was to eager and forgot that detail. Closing as not applicable.