[CI][FRONT] Storybook tests sharding and build optimization

[prastoin]

Introduction

The idea here is to improve perf nor fluidity of both storybook build and tests execution duration.

Levers:

• Storybook tests shards
• Refactored storybook's build caching using actions/cache/restore and actions/cache/save to avoid useless computation with we wanna just write or retrieve it
• Running storybook build with --test flag ( please note that we only disable docs addons in order to keep coverage up and running )

closes twentyhq/core-team-issues#49

[greptile-apps]

PR Summary

Implemented comprehensive Storybook test sharding and caching optimizations to improve CI performance and build times.

• Added 4-way test sharding in .github/workflows/ci-front.yaml with separate coverage artifacts for each shard
• Optimized Storybook build caching using actions/cache/restore and actions/cache/save with SHA-based keys
• Added --test flag to Storybook builds in nx.json to disable docs plugins during testing
• Configured test scopes (modules/pages/performance) to run in parallel with sharding support
• Added coverage report merging step to combine results from sharded test runs

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[github-actions]

	Fails
🚫	node failed.

Log

�[31mError: �[39m SyntaxError: Unexpected token C in JSON at position 0
    at JSON.parse (<anonymous>)
�[90m    at parseJSONFromBytes (node:internal/deps/undici/undici:5584:19)�[39m
�[90m    at successSteps (node:internal/deps/undici/undici:5555:27)�[39m
�[90m    at fullyReadBody (node:internal/deps/undici/undici:1665:9)�[39m
�[90m    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)�[39m
�[90m    at async specConsumeBody (node:internal/deps/undici/undici:5564:7)�[39m
danger-results://tmp/danger-results-77a9aa0d.json

Generated by 🚫 dangerJS against 36d796b