fix(training-sdk): remove the training SDK publishing (#2704)

## Proposed change

fix(training-sdk): remove the training SDK publishing flagged as
`private`

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packages/@o3r-training/training-sdk/project.json

@@ -24,7 +24,6 @@
       }
     },
     "lint": {},
-    "publish": {},
     "extract-folder-structure": {
       "cache": true,
       "executor": "nx:run-script",