[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

Built ocb with the changes and ran 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.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: czeltser / name: Chris Zeltser (fd7752c, 2b46779)

[bogdandrutu]

Do you mind adding some tests?

[github-actions]

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

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.

[czeltser]

Do you mind adding some tests?

@bogdandrutu Sorry for the delay. I've re-opened the MR here with tests.