feat: Downscope OAuth2 token included in ephemeral certificate #1450
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In the past, when using Auto IAM AuthN, the token embedded into the ephemeral certificate would have a broad scope. This commit ensures that in most cases, the embeddeded token has only a sqlservice.login scope.
When users provide a token to launch the proxy, the proxy will use that token with whatever scopes are attached.
Fixes #1446.