feat(exec)!: Adds support for enableInlineBuilds to the exec: fetcher

[arcanis]

What's the problem this PR addresses?

The exec: protocol logs aren't printed even when enableInlineBuilds is defined, which prevents seeing potential errors (especially on CI).

How did you fix it?

The fetcher will now respect enableInlineBuilds. I thought about adding a separate configuration setting, but it felt unnecessary as the reasons why one would want to see the output of the builds also require to show the output of the exec: package generation.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.