ENG-1092 update lambda to read ssm param at runtime

[susana-zhou1]

Description

update the lambda to receive the ssm parameter name and fetch secret value at runtime.

Context

currently the secret is directly passe to the lambda, if the ssm parameter is updated, we will need to redeploy the lambda to apply the changes. lambda reading secret at runtime will mean we don't need to redeploy everytime the secret is rotated

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

---

Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.