[datadog_csm_threats] supporting cws multi-policy in terraform

[homoeconomics]

Adding new resources and data sources to support the CWS multi-policy feature.

1. Updated the data source and resource datadog_csm_threats_agent_rule for users to manage their rules
2. Added a new data source resource datadog_csm_threats_policy for users to manage their policies.

• Create a policy resource:

resource "datadog_csm_threats_policy" "my_policy" {
    description  = "my terraform policy"
    enabled      = false
    name         = "TERRAFORM POLICY"
    tags         = ["env:staging"]
}

• Create a multi policy agent rule resource:

resource "datadog_csm_threats_agent_rule" "my_rule" {
    description  = "my terraform rule"
    enabled      = false
    expression   = "bind.addr.ip==1.1.1.1"
    name         = "TERRAFORM_RULE"
    policy_id    = datadog_csm_threats_policy.my_policy.id
    product_tags = ["foo:bar"]
}

TBD: record tests

[armcburney]

The code LGTM!

[QuentinGuillard]

/merge

[dd-devflow]

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2025-06-10 12:13:00 UTC ℹ️ Start processing command /merge

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2025-06-10 12:13:07 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in master is approximately 27m (p90).

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2025-06-10 12:38:40 UTC ℹ️ MergeQueue: This merge request was merged