* [TF FE] Refactor translation for Concat and ConcatV2 operations and add tests Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> * [TF FE] Correct the layer tests for passing * Apply code-review feedback: remove redundant function * Fix a name of function to create Concat model in the layer test Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com>