Edit region names for JetStream PyTorch resources

[vivianrwu]

Description

This PR edits the region name for manifest files on the JetStream PyTorch user guide to be consistent.

Tasks

• [x] The contributing guide has been read and followed.
• [x] The samples added / modified have been fully tested.
• [x] Workflow files have been added / modified, if applicable.
• [x] Region tags have been properly added, if new samples.
• [x] All dependencies are set to up-to-date versions, as applicable.

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 4 region tags.

- [ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-gemma-7b-it-2x4.yaml:15](https://github.com/vivianrwu/kubernetes-engine-samples/blob/10fe7e90b53ccf5f0f39479d305b8a218571dfab/ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-gemma-7b-it-2x4.yaml#L15), tag `gke_ai_ml_llm_serving_tpus_jetstream_pytorch_gemma_7b_it_2x4` - [ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-llama-3-8b-2x4.yaml:15](https://github.com/vivianrwu/kubernetes-engine-samples/blob/10fe7e90b53ccf5f0f39479d305b8a218571dfab/ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-llama-3-8b-2x4.yaml#L15), tag `gke_ai_ml_llm_serving_tpus_jetstream_pytorch_llama_3_8b_2x4` - [ai-ml/llm-serving-tpus-jetstream/pytorch/job-gemma-7b-it.yaml:15](https://github.com/vivianrwu/kubernetes-engine-samples/blob/10fe7e90b53ccf5f0f39479d305b8a218571dfab/ai-ml/llm-serving-tpus-jetstream/pytorch/job-gemma-7b-it.yaml#L15), tag `gke_ai_ml_llm_serving_tpus_jetstream_pytorch_job_gemma_7b_it` - [ai-ml/llm-serving-tpus-jetstream/pytorch/job-llama-3-8b.yaml:15](https://github.com/vivianrwu/kubernetes-engine-samples/blob/10fe7e90b53ccf5f0f39479d305b8a218571dfab/ai-ml/llm-serving-tpus-jetstream/pytorch/job-llama-3-8b.yaml#L15), tag `gke_ai_ml_llm_serving_tpus_jetstream_pytorch_job_llama_3_8b`

You are about to delete 4 region tags.

- [ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-gemma-7b-it-2x4.yaml:15](https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/df2550efd8b711644a13c819020b84171c5a49b3/ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-gemma-7b-it-2x4.yaml#L15), tag `gke_ai_ml_llm_serving_gemma_jetstream_pytorch_gemma_7b_it_2x4` - [ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-llama-3-8b-2x4.yaml:15](https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/df2550efd8b711644a13c819020b84171c5a49b3/ai-ml/llm-serving-tpus-jetstream/pytorch/jetstream-pytorch-llama-3-8b-2x4.yaml#L15), tag `gke_ai_ml_llm_serving_gemma_jetstream_pytorch_llama_3_8b_it_2x4` - [ai-ml/llm-serving-tpus-jetstream/pytorch/job-gemma-7b-it.yaml:15](https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/df2550efd8b711644a13c819020b84171c5a49b3/ai-ml/llm-serving-tpus-jetstream/pytorch/job-gemma-7b-it.yaml#L15), tag `gke_ai_ml_llm_serving_gemma_jetstream_pytorch_job_gemma_7b_it` - [ai-ml/llm-serving-tpus-jetstream/pytorch/job-llama-3-8b.yaml:15](https://github.com/GoogleCloudPlatform/kubernetes-engine-samples/blob/df2550efd8b711644a13c819020b84171c5a49b3/ai-ml/llm-serving-tpus-jetstream/pytorch/job-llama-3-8b.yaml#L15), tag `gke_ai_ml_llm_serving_gemma_jetstream_pytorch_job_llama_3_8b`

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