Migrate Keys from ml-commons AWS secret manager

[ryanbogan]

@peterzhuamazon Can you migrate the secrets for the OpenAI and Cohere keys from the ml-commons account?

[peterzhuamazon]

Initial PRs related to @ryanbogan openai test PR opensearch-project/ml-commons#1073 to have secrets in ml-commons account for github actions:

• Add test keys to CI related workflows ml-commons#1099
• Tweak workflow event so ci can retrieve credentails correctly ml-commons#1102
• Update ml CI workflow checkout ref to be PR commit ml-commons#1114
• Add shell bash settings for windows github actions to export credentials ml-commons#1116