Fix lambda iam

[martmull]

As title, fix lambda driver for serverless functions

[greptile-apps]

PR Summary

Improved security and configurability of Lambda driver implementation for serverless functions by modifying credential handling and role management.

• Reduced credential duration from 10 hours to 1 hour in packages/twenty-server/src/engine/core-modules/serverless/drivers/lambda.driver.ts for enhanced security
• Added configurable subhostingRole option in LambdaDriverOptions interface to replace hardcoded role ARN
• Implemented credential expiry check and refresh mechanism in getLambdaClient() method
• Added robust error handling for missing credentials in getAssumeRoleCredentials()

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