[ET-VK] Fix pipeline indexing bug in batch create_pipelines #17192
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The original code created pipelines for all descriptors but used a separate index counter during cache insertion that only incremented for non-cached entries. This caused incorrect pipeline handles to be associated with keys when some descriptors were already cached, and leaked handles for duplicates. Fix by filtering out already-cached descriptors upfront, ensuring 1:1 correspondence between the created pipelines array and cache insertions. Authored with Claude. Differential Revision: [D92171360](https://our.internmc.facebook.com/intern/diff/D92171360/) ghstack-source-id: 337901649 Pull Request resolved: #17159
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17192
Note: Links to docs will display an error until the docs builds have been completed. ❌ 5 New FailuresAs of commit 08f1b08 with merge base 593775b ( NEW FAILURES - The following jobs have failed:
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #17159 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/403/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/403/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/402/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/403/orig
Differential Revision: D92171360
@diff-train-skip-merge