Don't error log when getting group push rules gives 404 Not Found

Christoffer Sawickirequested to merge
qerub/terraform-provider-gitlab:patch-1 into main

...as this happens when no push rules are set for the group and the current behavior causes lots of erratic error messages.

Fixup to 82de3e84 / Add push rule support to group resource (!1730 - merged).

Related issue: https://github.com/pulumi/pulumi-gitlab/issues/514

Edited by Christoffer Sawicki

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