[Project Solar / Phase 1 / Cherry-pick] Update packages/components CSS organization

[didoo]

📌 Summary

Small PR to cherry-pick from #3237 some of the changes introduced to the CSS architecture/organization that will be necessary for the differentiation between consumers migrating to the "carbonized" HDS and consumers that will remain on the "classic" HDS path

🛠️ Detailed description

In this PR I have:

• re-organized Sass files for HDS components
  • separated the “common” part from the main index (this will be a necessary change in in [WIP-00] [Project Solar / Milestone 1] Main feature branch #3237) leaving it only contain two import: tokens and components
  • moved all the Sass files directly related to the HDS components into their own file (index.scss under the components folder)
• updated a blueprint with the new path for the components' index file

⚠️ Note: I have not added a changeset because there is no impact on the consumers. The only way in which they may be impacted, is if they were re-exporting our @use declarations, but this is really unlikely (I also checked if I spotted something similar in our codebases, but I could not find anything meaningful)

🔗 External links

Jira ticket: https://hashicorp.atlassian.net/browse/HDS-6033

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👀 Component checklist

• [ ] A changelog entry was added via Changesets if needed (see templates here)

💬 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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[shleewhite]

Nit: this is the old file header, should be IBM now

[didoo]

I’ve created a ticket here, so we can update them all in one batch https://hashicorp.atlassian.net/browse/HDS-6034 (context)