refactor: importAnalysisBuild

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Description

Pulling out some minor refactors from #19722

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With this refactor, I also have a follow up perf optimization to de-duplicate the chunk registry:
#19757

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@sapphi-red Any updates on this?

Just so you know, this is a refactor as part of a larger fix in #19722.
All tests are passing, and it fixes a fundamental bug in how Vite patches dynamic imports.

Would love to get these in before it becomes outdated.

[sapphi-red]

We normally require 2 or more reviews to merge a PR, so another review is needed. Let me add this to the team board so that I can discuss in the team meeting and speed up the process.

[sapphi-red]

First of all, thank you for your work on these pull requests.

In our last team meeting, we discussed refactoring PRs and established a policy for coding style changes (see contribution guide change). Even if we also agree some of these PRs have value, they also make git history more difficult to navigate and potentially introduce subtle issues. In general, we'd like to only merge refactors when they are required to implement features or bug fixes.

So we prefer not to merge this specific PR as it primarily contains style adjustments. However, we'd still love to merge the other dependent PRs if you'd like to rebase those onto main.

Thanks!