Fix: Added Validation for zia_forwarding_control_rule

[willguibr]

[codecov-commenter]

Codecov Report

:x: Patch coverage is 38.83495% with 63 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
zia/resource_zia_forwarding_control_rule.go	0.00%	30 Missing and 1 partial :warning:
...zia_traffic_forwarding_gre_vip_recommended_list.go	56.00%	22 Missing :warning:
zia/utils.go	0.00%	10 Missing :warning:

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