fix: plat-5545 reading new env var for actions

[NicoMolinaOZ]

Summary

Ticket

• A new environment variable is added to know if the SDK is invocating through an action with custom code.

Testing Process

• Create an action with a custom code that uses a relayer (for example, to send a transaction), and verify that everything is ok.
• Invoke a relayer transaction without an action, it means from a script or using an external backend solution. Verify everything works well.

Checklist

• Add a reference to related issues in the PR description.
• Add unit tests if applicable.

[changeset-bot]

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Latest commit: a18a14e

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