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4724c77d - Consolidate VariableTracker construction through variable builders in exc.py, utils.py, nn_module.py (#173451)

Consolidate VariableTracker construction through variable builders in exc.py, utils.py, nn_module.py (#173451) Summary: Route direct variable construction through SourcelessBuilder.create() or VariableBuilder where tx is available. Some callsites in static handler methods that lack tx context are left unchanged. Uses local imports to avoid circular import issues. Address step 1 described in https://github.com/pytorch/pytorch/issues/170361 X-link: https://github.com/pytorch/pytorch/pull/173451 Approved by: https://github.com/Lucaskabela, https://github.com/anijain2305 ghstack dependencies: #173439, #173441, #173442, #173458 Reviewed By: izaitsevfb Differential Revision: D92237691 fbshipit-source-id: ee21d8602fce0bb8f335fece17e1f86fa0a64a69