Workload Identity, Task API, and Dynamic Node Metadata Docs (#16102)

* docs: add dynamic node metadata api docs

Also update all paths in the client API docs to explicitly state the
`/v1/` prefix. We're inconsistent about that, but I think it's better to
display the full path than to only show the fragment. If we ever do a
`/v2/` whether or not we explicitly state `/v1/` in our docs won't be
our greatest concern.

* docs: add task-api docs

website/data/api-docs-nav-data.json

@@ -14,6 +14,10 @@
     "title": "JSON Jobs",
     "path": "json-jobs"
   },
+  {
+    "title": "Task API",
+    "path": "task-api"
+  },
   {
     "divider": true
   },