[Project Solar / Phase 1 / Cherry-pick] Updated prepublishOnly in package.json to use a custom script

[didoo]

📌 Summary

Small PR to cherry-pick from #3237 the implementation of a custom script to check that the correct CSS files are generated in the build step before proceeding with the publication of the package.

Note: these changes were first introduced/implemented in #3462

🛠️ Detailed description

In this PR I have:

• updated prepublishOnly in package.json to use a custom script

I have tested the script by:

• removing the file design-system-power-select-overrides.css from the dist folder
• running the script pnpm test:dist-files → script threw an error
• re-building the components dist (via pnpm build)
• running the script pnpm test:dist-files → script silently succeeded

🔗 External links

Jira ticket: https://hashicorp.atlassian.net/browse/HDS-6028

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👀 Component checklist

💬 Please consider using conventional comments when reviewing this PR.

📋 PCI review checklist

• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've worked with GRC to document the impact of any changes to security controls.
  Examples of changes to controls include access controls, encryption, logging, etc.
• If applicable, I've worked with GRC to ensure compliance due to a significant change to the in-scope PCI environment.
  Examples include changes to operating systems, ports, protocols, services, cryptography-related components, PII processing code, etc.

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[didoo]

@alex-ju I am going to merge this one, to reduce possibility of conflicts; when you're back from PTO can you review it anyway (since you implemented this script in the first place)? thanks

[alex-ju]

@alex-ju I am going to merge this one, to reduce possibility of conflicts; when you're back from PTO can you review it anyway (since you implemented this script in the first place)? thanks

Looks good! Thanks for the heads-up