feat: remove custom OAuth metadata server #1060

Job	Run time
python / Check Python library	50s
typescript / Check Typescript chatbot	33s
typescript / Check Typescript library	41s
python / Check Python chatbot	9s
python / Check Python E2E tests	9s
typescript / Check Typescript E2E tests	33s
cdk / Check Python-based MCP Doc Server	1m 58s
cdk / Check Python-based Time Server	1m 45s
cdk / Check Python-based Book Search Server	2m 24s
cdk / Check Python-based Dad Jokes Server	2m 1s
cdk / Check Python-based Inspiration Server	31s
cdk / Check Typescript-based Cognito stack	24s
cdk / Check Typescript-based Dog Facts Server	1m 38s
cdk / Check Typescript-based Weather Alerts Server	1m 33s
cdk / Check Typescript-based Cat Facts Server	1m 34s
cdk / Check Typescript-based Dictionary Server	1m 54s
	18m 37s

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