refactor(angular-ssg): Update main.server.ts to improve startup robustness

[michaelmkraus]

Proposed changes

• update main.server.ts to improve startup robustness

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)

🔭🐙🐈 Test this branch here: https://design-system.deutschebahn.com/core-web/review/fix-run-angular-ssr-showcases

[changeset-bot]

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Latest commit: ac5c99e

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