perf: use map and await generateSwagger

[retrogtx]

• Uses Map for improved performance in groupAndSortPathsByFirstTag in the sorting function
• Await generateSwagger to ensure complete documentation before server start
• remove an unused import TagObject

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1 reviewer was added to this PR based on Keith Williams's automation.

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[github-actions[bot]]

E2E results are ready!

• Workflow #35342.1 latest results

[anikdhabal]

Thanks for your work @retrogtx , but it's okay now