Remove get_writer function and initialize writer variable in calling function

[payalcha]

Remove the get_writer function and initialize the SummaryWriter directly in the write_metric function in multiple files.

• openfl-tutorials/deprecated/native_api/Federated_Pytorch_MNIST_Tutorial.ipynb

  • Remove the direct initialization of SummaryWriter and replace it with a get_writer function.
  • Use the get_writer function to initialize the writer in the write_metric function.

• openfl-workspace/experimental/workflow/AggregatorBasedWorkflow/102_aggregator_validation/src/utils.py

  • Remove the direct initialization of SummaryWriter and replace it with a get_writer function.
  • Use the get_writer function to initialize the writer in the write_metric function.

• openfl-workspace/experimental/workflow/AggregatorBasedWorkflow/104_keras_mnist/src/utils.py

  • Remove the direct initialization of SummaryWriter and replace it with a get_writer function.
  • Use the get_writer function to initialize the writer in the write_metric function.

• openfl-workspace/experimental/workflow/AggregatorBasedWorkflow/301_torch_cnn_mnist_watermarking/src/utils.py

  • Remove the direct initialization of SummaryWriter and replace it with a get_writer function.
  • Use the get_writer function to initialize the writer in the write_metric function.

• openfl-workspace/experimental/workflow/AggregatorBasedWorkflow/501_pytorch_tinyimagenet_transfer_learning/src/utils.py

  • Remove the direct initialization of SummaryWriter and replace it with a get_writer function.
  • Use the get_writer function to initialize the writer in the write_metric function.

• openfl-workspace/experimental/workflow/AggregatorBasedWorkflow/vertical_fl/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_datastore_cli/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_include_exclude/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_internalloop/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_private_attributes_initialization_with_both_options/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_private_attributes_initialization_without_callable/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_private_attributes/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_reference_with_include_exclude/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_reference/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_subset_of_collaborators/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.

• tests/github/experimental/workflow/AggregatorBasedWorkflow/testcase_validate_particpant_names/src/utils.py

  • Remove the get_writer function.
  • Initialize SummaryWriter directly in the write_metric function.