Artifact debug repr should include the owner

[benjaminp]

As of bf4123d, Artifact equality takes the artifact owner into account. Since the Starlark repr of Artifact only prints the execpath, it's possible to have two artifacts, a and b, that have the same execpath (and thus repr) but satisfy a != b. Unsurprisingly, this generates confusion–even for seasoned Blaze developers. Therefore, I propose including the owner in the output of printing an artifact.

[aiuto]

Assigning to configurability for now, this might be Execution.

[jin]

Reassigning to Starlark, since this is about repr().

[brandjon]

+1, appears to have hit me in #7655.

Edit: meant to reply on #7658, not this bug, but this is problematic for similar reasons.

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