[cmd/builder] Generate replace directives when path is specified for provider

[czeltser]

Description

Fixes a bug where replace directives were not being generated when the path was specified for a provider in the builder configuration.

Testing

Unit tests were added. In addition, the change can be tested manually by building ocb with the changes, and running it on the following configuration:

dist:
  name: otelcol
  output_path: ./build

receivers:
  - gomod: go.opentelemetry.io/collector/receiver/otlpreceiver v0.99.0

exporters:
  - gomod: go.opentelemetry.io/collector/exporter/otlpexporter v0.99.0

providers:
  - gomod: foo.bar/dynamodbprovider v0.0.0
    path: ./confmap/dynamodbprovider

The generated go.mod contained the expected replace statement.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.