optable-targeting: update macros, fail early if tenant and origin are not configured

[justadreamer]

🔧 Type of changes

• bugfix

✨ What's the context?

Macros in the endpoint URL should be enclosed into double curly bracket '{{}}', not single '{}'. Also if tenant or origin are not provided in the account configuration the hook fails early with a 1% error logging rate.

🧠 Rationale behind the change

A requirement to macros to potentially prevent syntax collisions. Also if account is misconfigured to not include tenant or origin params - these are mandatory - the hook fails early with appropriate error message with 1% error logging rate.

🧪 Test plan

Unit tests + ran manual integration testing.

🏎 Quality check

• Are your changes following our code style guidelines?
• Are there any breaking changes in your code? - Yes it will require a change of host configuration slightly - they will have to use {{}} to enclose the macros - need to update the docs