Add TestTagsIssue2978ReproTagReplacement that specifically tests the
scenario from issue #2978:
- Register node with tag:foo via web auth with --advertise-tags
- Admin changes tag to tag:bar via SetNodeTags
- Verify client's self view updates (not just server-side)
The test performs multiple tag replacements with timing checks to
verify whether tag updates propagate to the node's self view after
the first call (fixed behavior) or only after a redundant second
call (bug behavior).
Add helper functions for test validation:
- assertNodeSelfHasTagsWithCollect: validates client's status.Self.Tags
- assertNetmapSelfHasTagsWithCollect: validates client's netmap.SelfNode.Tags
Updates #2978
07a4b1b1fd