Incorrect value for $CRAFT_PARALLEL_BUILD_COUNT in project metadata

[mr-cal]

What needs to get done

Call _get_parallel_build_count() when expanding the environment in the application.

Probably requires moving that function to a util module.

Why it needs to get done

$CRAFT_PARALLEL_BUILD_COUNT always evaluates to 1 in a project yaml file

So the desktop team can build the core24 firefox snap in a reasonable amount of time (canonical/snapcraft#4785)

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3524.

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