Add test of the apContext.configVars.sendgrid_key for EmailNode

[chrisli30]

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[Copilot]

Pull Request Overview

This PR introduces two new test functions to validate that global secrets – in particular, sendgrid_key – are properly substituted in REST API calls.

• Adds TestRestRequestSendGridGlobalSecret to verify the SendGrid global secret substitution and response structure
• Adds TestRestRequestArbitraryGlobalSecret to demonstrate dynamic substitution of any secret name
• Updates RestProcessor documentation in vm_runner_rest.go to explain the usage of global secrets

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
core/taskengine/vm_runner_rest_test.go	Adds test functions for verifying secret substitution in REST calls
core/taskengine/vm_runner_rest.go	Adds documentation comments to RestProcessor

Comments suppressed due to low confidence (1)

core/taskengine/vm_runner_rest.go:1

• The function name 'NewRestProrcessor' appears to be misspelled; consider renaming it to 'NewRestProcessor' for clarity.

package taskengine