Ensure worker synchronization during resume

[abidwael]

This PR ensures

• We're not accessing keys that don't exist in the progress tracker dictionary.
• All keys of the progress tracker dictionary are available for initialization.
• All workers are synced on whether to resume or create a new progress tracker (due to inconsistencies in the output of resume_files_exist)

[justinxzhao]

Thanks!

[github-actions]

Unit Test Results

  6 files  ±  0    6 suites  ±0   45m 53s ⏱️ + 5m 41s
33 tests  - 48  29 ✔️  - 46    4 💤  - 2  0 ❌ ±0 
86 runs   - 27  72 ✔️  - 26  14 💤  - 1  0 ❌ ±0 

Results for commit d391080. ± Comparison against base commit 2b3db46.

This pull request removes 48 tests.

tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing0-False]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing0-True]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing0-augmentation_pipeline_ops2]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing1-False]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing1-True]
tests.ludwig.augmentation.test_augmentation_pipeline ‑ test_ray_model_training_with_augmentation_pipeline[preprocessing1-augmentation_pipeline_ops2]
tests.ludwig.automl.test_base_config ‑ test_dataset_info[dask]
tests.ludwig.automl.test_base_config ‑ test_dataset_info[pandas]
tests.ludwig.automl.test_base_config ‑ test_infer_parquet_types
tests.ludwig.automl.test_base_config ‑ test_is_field_boolean[dask]
…