Update receiverhelper for requests that failed to be received

[gizas]

Description

This is an ongoing work to add :

• In the endOp function of ObsReport, errors are classified as either:
  • Downstream errors (refused) - when internal.IsDownstreamError(err) returns true
  • Internal errors - when the error is not a downstream error
• New metrics metricsotelcol_receiver_internal_errors_spans, otelcol_receiver_internal_errors_metric_points and otelcol_receiver_internal_errors_log_records in case of inetrnal errors returned above
• Support in OTLP receiver to handle IsClientDisconnectError. Network disconnect errors will be reported in otelcol_receiver_internal_errors_metric_points
• Support of otelcol_receiver_requests metric that will determines the outcome of the request:
  • "success" if there's no error
  • "refused" if there's a downstream error
  • "failure" if there's an internal error

Link to tracking issue

Fixes # #12207

Testing

Only added the integration tests. That is why opened this is as a draft

Documentation

See updated receiver/receiverhelper/documentation.md

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: gizas / name: Andrew Gizas (ca361bb, 8a2116c, b926b14, 140fc8f, 83b9462, 6f013a7, 45ab725, d729b2c, 1803e33, 85bcabb, d4c452a, 61e3468, 6ee5ec8, b9e788d, 0019011, a6db9e1, 81c6f86)