feat: Directly use Cognito OAuth metadata endpoint instead of API Gat… #1055

Job	Run time
python / Check Python library	49s
python / Check Python E2E tests	8s
python / Check Python chatbot	10s
cdk / Check Typescript-based Weather Alerts Server	1m 33s
typescript / Check Typescript E2E tests	37s
typescript / Check Typescript library	43s
cdk / Check Typescript-based Dictionary Server	1m 43s
cdk / Check Typescript-based Cognito stack	19s
cdk / Check Python-based Inspiration Server	27s
typescript / Check Typescript chatbot	37s
cdk / Check Python-based MCP Doc Server	2m 3s
cdk / Check Python-based Book Search Server	2m 23s
cdk / Check Python-based Time Server	1m 53s
cdk / Check Typescript-based Cat Facts Server	1m 32s
cdk / Check Python-based Dad Jokes Server	1m 52s
cdk / Check Typescript-based Dog Facts Server	1m 33s
	18m 22s

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