fix(vite-plugin-angular): plugin causing build failures in version migration

[choyiny]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Which package are you modifying?

• vite-plugin-angular
• vite-plugin-nitro
• astro-angular
• create-analog
• router
• platform
• content
• nx-plugin
• trpc

What is the current behavior?

A weird edge case with projects migrating from Angular v16 and Analog v0.2 causes builds to fail after upgrading:

An unhandled exception occurred: [@analogjs/vite-plugin-nitro] [@analogjs/vite-plugin-angular] Cannot read properties of undefined (reading 'Error')

This is due to ts.DiagnosticCategory being resolved to undefined instead of the actual Typescript Enum in typescript.d.ts. However, I was not able to find the reason behind this.

What is the new behavior?

If ts.DiagnosticCategory is undefined, skip propagating errors and warnings in createFileEmitter.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[optional] What gif best describes this PR or how it makes you feel?

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