replace expired connected app certificate and document process for the future

[jwtruver]

[c-simpson]

@sposerina Please confirm that SalesForce API key expiration is not checked. If that's correct, we can close this issue

[sposerina]

Certificate expiration is currently not checked but there is no official documentation that confirms this will not change in the future. Action items are to document the process of replacing the certificate and create the necessary credentials for the pipeline to authenticate with Salesforce.