Flip default for --incompatible_disable_target_provider_fields

[alexeagle]

Help to finish bazelbuild/bazel#9014 by finding existing projects on Bazel CI which need their default set to false, then land a PR in Bazel which changes the default value for new projects.

[cpsauer]

(Is this a duplicate of #36? If so, perhaps we should close this one because that one has a backlink.)