[datadog_reference_table] Require schema attrs

[g-brizolier]

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What does this PR do?

Marks primary_keys, fields.name, and fields.type as Required on the datadog_reference_table resource schema. Previously these were Optional, which allowed Terraform plans to succeed without them, only to fail at apply time with a 400 Bad Request from the API:

{"errors":[{"status":"400","title":"BadRequest","detail":"attribute \"primary_keys\" is required"},{"status":"400","title":"Bad Request","detail":"attribute \"fields\" is required"}]}

Details

• primary_keys: Changed from Optional to Required. The SizeAtLeast(1) validator was already present but was skipped for null (omitted) values since Optional attributes are null when not set. Making it Required ensures the validator always runs.
• fields block: Already enforced by listvalidator.SizeAtLeast(1) on the ListNestedBlock (blocks produce empty lists, not null, so the validator always fires).
• fields.name and fields.type: Changed from Optional to Required to match API requirements.
• All attributes retain Computed: true for API read population.

Motivation

Reported via Slack — users hit 400 errors at terraform apply time because the provider accepted configs missing required schema attributes. This change surfaces the error at terraform validate/plan time instead.

Additional Notes

All existing tests and examples already specify these attributes, so no test changes are needed.

[datadog-datadog-prod-us1]

Bits AI Dev Agent Status: ✅ Done [Fix CI Errors] [View Dev Agent Session]

You can ask for changes by mentioning @DataDog in a comment.

[g-brizolier]

• [datadog_reference_table] Require schema attrs #3511 👈 (View in Graphite)
• master

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