refactor: mitigate deactivated node lifecycle scripts

[mfranzke]

Proposed changes

We need to run this optimization within the same node script because we deactivated node lifecycle scripts.

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improvements to existing components or architectural decisions)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Further comments

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/refactor-mitigate-deactivated-node-lifecycle-scripts

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Latest commit: 929801f

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Pull request overview

This PR refactors the foundations package to consolidate icon overview generation and formatting into a single script execution, addressing the repository's use of --ignore-scripts during installation which prevents automatic lifecycle hook execution.

• Combines the postcopy-prepare:icon-overview script with copy-prepare:icon-overview to run prettier formatting inline
• Removes the now-redundant postcopy-prepare:icon-overview script that was previously triggered via lifecycle hooks