Show option name too for unset mandatory task property

[Vampire]

If you have a mandatory task property with an @Option annotation with a different option name than the the task property, only the property name is shown in the error message.

For example for this property:

    @get:Input
    @get:Option(
            option = "fxVersion",
            description = "The JavaFX version to prepare"
    )
    abstract val version: Property<String>

if the property is not set, the error says No value has been specified for property 'version'.
While this is correct, in this case it is intentional, as the property is meant to always be set from commandline.
It would be nice if the error would also suggest using the commandline option to set the property.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. If you're interested in how we try to keep the backlog in a healthy state, please read our blog post on how we refine our backlog. If you feel this is something you could contribute, please have a look at our Contributor Guide. Thank you for your contribution.

[Vampire]

Still relevant with 6.7.1.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. Given the limited bandwidth of the team, it will be automatically closed if no further activity occurs. If you're interested in how we try to keep the backlog in a healthy state, please read our blog post on how we refine our backlog. If you feel this is something you could contribute, please have a look at our Contributor Guide. Thank you for your contribution.