fix(cloud-integrations): Add error handling in the resource newrelic_cloud_gcp_integrations

[abasha1234]

Description

This PR will fix error handling upon trying to run terraform apply (in Staging) with the resource newrelic_cloud_gcp_integrations.

Ticket : NR-262901

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)

Checklist:

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• [x] My commit message follows conventional commits
• [x] My code is formatted to Go standards
• [x] I have performed a self-review of my own code

[pranav-new-relic]

Merging this PR - these changes look good to me 👍