Check if execution response came from SDK

[goodoldneon]

Description

• Error if the execution response did not come from the SDK.
• Add stuff to the headers package.

Context

This change is needed because a non-SDK response with a 200 status results in a "successful" function run. This can happen when a proxy is misconfigured.

Testing

• Function run succeeded when the execution response was from the SDK
• Function run failed when the execution response was HTML

Type of change (choose one)

• Chore (refactors, upgrades, etc.)
• Bug fix (non-breaking change that fixes an issue)
• Security fix (non-breaking change that fixes a potential vulnerability)
• Docs
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist

• I've linked any associated issues to this PR.
• I've tested my own changes.

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
ui	⬜️ Ignored (Inspect)	Visit Preview		Nov 29, 2023 8:44pm

[goodoldneon]

@jpwilliams which content type does the TS SDK use for streaming responses?

[jpwilliams]

@goodoldneon: @jpwilliams which content type does the TS SDK use for streaming responses?

Still application/json - every response will always return Content-Type: application/json.