Update agent endpoint in the single binary

[pingsutw]

Tracking issue

Describe your changes

update endpoint. flyte-sandbox-http -> flyte-binary-http

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

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Note to reviewers

[eapolinario]

We should keep an override in the case of sandbox. More specifically, we need to add something like https://github.com/flyteorg/flyte/blob/master/charts/flyte-binary/values.yaml#L151-L154 to the sandbox values.yaml file.