ci(e2e): reduce number of shards

[alexfreska]

• Adjust e2e test shard count

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Pull Request Overview

This PR reduces the number of test shards for end-to-end testing from 12 to 6 across all e2e test jobs. This change likely aims to optimize CI performance by reducing parallelization overhead or resource consumption.

• Reduces shard count from 12 to 6 for all e2e test projects
• Updates both shardIndex arrays and shardTotal values consistently

[alexfreska]

• ci(e2e): reduce number of shards #1239 👈 (View in Graphite)
• main

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