[chore] Remove unused internal code (#33690)

This file appears to be no longer used. Since it's in an `internal`
directory it's not exposed publicly, so I don't believe it needs a
changelog.

For context, I believe its original use was to be consumed by
`cmd/configschema`, which has since been
[deleted](#33384).
I believe we simply missed this file in the removal process.

.github/workflows/scripts/check-collector-module-version.sh

@@ -45,7 +45,7 @@ check_collector_versions_correct() {
    done
 }
 
-MAIN_MOD_FILE="./go.mod"
+MAIN_MOD_FILE="./cmd/otelcontribcol/go.mod"
 
 
 BETA_MODULE="go.opentelemetry.io/collector"

CONTRIBUTING.md

@@ -245,7 +245,7 @@ When submitting a component to the community, consider breaking it down into sep
     to the [OpenTelemetry.io registry](https://github.com/open-telemetry/opentelemetry.io#adding-a-project-to-the-opentelemetry-registry).
 
 ### Releasing New Components
-After a component has been approved and merged, and has been enabled in `internal/components/`, it must be added to the
+After a component has been merged it must be added to the
 [OpenTelemetry Collector Contrib's release manifest.yaml](https://github.com/open-telemetry/opentelemetry-collector-releases/blob/main/distributions/otelcol-contrib/manifest.yaml)
 to be included in the distributed otelcol-contrib binaries and docker images.
 

extension/sigv4authextension/design.md

@@ -563,5 +563,3 @@ Additionally, a few other files will be modified to reflect changes made, for ex
 * `go.sum`
 * `versions.yaml`
 * `.github/CODEOWNERS`
-* `internal/components/components.go`
-* `internal/components/extensions_test.go`