Fix executing interpolation when skip_interpolations is True

[danielcoman]

Description

Fixes #88

Related Issue

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
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• I have added tests to cover my changes.
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[danielcoman]

Fixes #88

[danielcoman]

@ecojan seems resolve_env is and interpolation and should respect skip_interpolations bool. Can you please check this change is not breaking any expected behavior?

[ecojan]

Change makes sense, seeing as all interpolations should be skipped if the flag is set to true (and env variables, just like secrets) could be treated as such.