[chore] Use mdatagen for configgrpc, configauth, configretry and confignet (#15639)

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#### Description

Uses mdatagen for all config packages

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Author: mx-psi

.github/workflows/utils/cspell.json

@@ -533,6 +533,7 @@
       "validatable",
       "vanityurl",
       "vmmetrics",
+      "winio",
       "withauth",
       "xconfighttp",
       "xconfmap",

config/configauth/configauth.go

@@ -6,6 +6,8 @@
 // exporters to add authentication on outgoing requests.
 package configauth // import "go.opentelemetry.io/collector/config/configauth"
 
+//go:generate mdatagen metadata.yaml
+
 import (
 	"context"
 	"errors"

config/configauth/package_test.go …fig/configauth/generated_package_test.goconfig/configauth/package_test.go renamed to config/configauth/generated_package_test.go config/configauth/package_test.go renamed to config/configauth/generated_package_test.go

@@ -7,3 +7,5 @@
 // The configuration structs in this package may be shared across signals, but
 // assume each struct is used for a single protocol and component.
 package configgrpc // import "go.opentelemetry.io/collector/config/configgrpc"
+
+//go:generate mdatagen metadata.yaml

config/configgrpc/doc.go

@@ -4,3 +4,5 @@
 // Package confignet implements the configuration settings for protocols to
 // connect and transport data information.
 package confignet // import "go.opentelemetry.io/collector/config/confignet"
+
+//go:generate mdatagen metadata.yaml

config/configgrpc/package_test.go …fig/configgrpc/generated_package_test.goconfig/configgrpc/package_test.go renamed to config/configgrpc/generated_package_test.go config/configgrpc/package_test.go renamed to config/configgrpc/generated_package_test.go

@@ -5,3 +5,9 @@ github_project: open-telemetry/opentelemetry-collector
 status:
   disable_codecov_badge: true
   class: pkg
+
+tests:
+  goleak:
+    ignore:
+      # go-winio starts a background goroutine for I/O completion on Windows that outlives the test.
+      any: ["github.com/Microsoft/go-winio.ioCompletionProcessor"]

config/confignet/doc.go

@@ -3,6 +3,8 @@
 
 package configretry // import "go.opentelemetry.io/collector/config/configretry"
 
+//go:generate mdatagen metadata.yaml
+
 import (
 	"errors"
 	"time"