tests: skipping tests with persistent failures

[ctrombley]

This PR skips some persistent failures preventing nightly tests from completing successfully. We will investigate or triage investigation for the skipped tests in TF-31172.

External links

• JIRA

[datadog-terraform-cloud-hashicorp]

⚠️ Tests

⚠️ Warnings

❄️ 3 New flaky tests detected

TestAgentsRead from agent_integration_test.go (Datadog)

failed test

TestAgentsRead/when_the_agent_exists from agent_integration_test.go (Datadog)

	Error Trace:	/home/runner/work/go-tfe/go-tfe/agent_integration_test.go:32
	            				/home/runner/go/pkg/mod/github.com/!data!dog/dd-trace-go/v2@v2.4.0/internal/civisibility/integrations/gotesting/instrumentation_orchestrion.go:242
	Error:      	Not equal: 
	            	expected: &tfe.Agent{ID:"agent-VQj2uv7yS1wBDJ2r", Name:"test-agent", IP:"40.65.61.151", Status:"idle", LastPingAt:"2025-11-26T19:38:33.696Z"}
	            	actual  : &tfe.Agent{ID:"agent-VQj2uv7yS1wBDJ2r", Name:"test-agent", IP:"40.65.61.151", Status:"exited", LastPingAt:"2025-11-26T19:38:34.967Z"}
	            	
	            	Diff:
	            	--- Expected
	            	+++ Actual
...

TestPlanExportsDelete_RunDependent from plan_export_integration_test.go (Datadog)

Run "run-UzaRXRUFJWGoorf1" unexpectedly errored

ℹ️ Info

🧪 All tests passed

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[github-actions]

Reminder to the contributor that merged this PR: if your changes have added important functionality or fixed a relevant bug, open a follow-up PR to update CHANGELOG.md with a note on your changes.