[8.19] (backport #21274) tf: configurable ec_target for smoke and benchmark

[mergify]

Motivation/summary

Align benchmark and smoke Terraform workflows with QA-targeted runs while keeping production defaults explicit and preserving pro naming used by secret storage.

This PR:

• adds explicit ec_target support (qa|pro) to benchmark and smoke Terraform stacks, with validation and a note that pro is the production secret-storage key
• updates ec provider endpoint mapping to use API hosts by target (qa -> public-api.qa.cld.elstc.co, pro -> api.elastic-cloud.com)
• passes ec_target through to the shared ec_deployment module and adds module-level target validation
• adds admin_console_urls mapping in ec_deployment so admin_console_url resolves to QA (admin.qa.cld.elstc.co) or production (admin.found.no) correctly
• updates smoke version lookups to resolve the API base from TF_VAR_ec_target only (normalized to lowercase) and append /api/v1 at call sites
• sets QA workflow defaults where QA credentials are used (TF_VAR_ec_target: qa, and smoke TF_VAR_region: gcp-us-central1)
• updates benchmark system profiles to QA-compatible ess_region values and defines worker_region per profile (closest worker region)
• regenerates Terraform docs for testing/infra/terraform/modules/ec_deployment

Checklist

• Update CHANGELOG.asciidoc
• Documentation has been updated

For functional changes, consider:

• Is it observable through the addition of either logging or metrics?
• Is its use being published in telemetry to enable product improvement?
• Have system tests been added to avoid regression?

How to test these changes

Manually trigger workflow in GH Actions

Related issues

Fixes #21268
Supersedes #21269
Follow-up to #21222

---

This is an automatic backport of pull request #21274 done by Mergify.

[mergify]

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Changes to be committed:
	modified:   .github/workflows/benchmarks.yml
	modified:   .github/workflows/smoke-tests-os.yml
	modified:   testing/benchmark/README.md
	modified:   testing/benchmark/main.tf
	modified:   testing/benchmark/system-profiles/16GB_ARM-x2zone.tfvars
	modified:   testing/benchmark/system-profiles/16GBx2zone-aws.tfvars
	modified:   testing/benchmark/system-profiles/16GBx2zone-azure.tfvars
	modified:   testing/benchmark/system-profiles/16GBx2zone-gcp.tfvars
	modified:   testing/benchmark/system-profiles/32GB_ARM-x2zone.tfvars
	modified:   testing/benchmark/system-profiles/32GBx2zone-aws.tfvars
	modified:   testing/benchmark/system-profiles/32GBx2zone-azure.tfvars
	modified:   testing/benchmark/system-profiles/32GBx2zone-gcp.tfvars
	modified:   testing/benchmark/system-profiles/8GB_ARM-x1zone.tfvars
	modified:   testing/benchmark/system-profiles/8GBx1zone-aws.tfvars
	modified:   testing/benchmark/system-profiles/8GBx1zone-azure.tfvars
	modified:   testing/benchmark/system-profiles/8GBx1zone-gcp.tfvars
	modified:   testing/benchmark/variables.tf
	modified:   testing/infra/terraform/modules/ec_deployment/README.md
	modified:   testing/infra/terraform/modules/ec_deployment/variables.tf
	modified:   testing/smoke/lib.sh
	modified:   testing/smoke/supported-os/main.tf

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   testing/infra/terraform/modules/ec_deployment/outputs.tf

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[github-actions]

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[prodsecmachine]

✅ Snyk checks have passed. No issues have been found so far.

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✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues

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[mergify]

Queued — the merge queue status continues in this comment ↓.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-06-29 13:41 UTC · Rule: default · triggered by rule squash and merge backport PRs after CI passes
• ✅ Checks passed · on draft merge queue: checking 8.19 (cdfbe7b) and #21281 together #21284
• ✅ Merged — 2026-06-29 13:46 UTC · at e00be16bc7375d2b7471f5346c5946b9cdeb630b · squash

This pull request spent 4 minutes 23 seconds in the queue, including 3 minutes 42 seconds running CI.

Required conditions to merge

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• check-success=test (macos-latest)
• github-review-approved [🛡 GitHub branch protection]
  • [8.19] (backport #21274) tf: configurable ec_target for smoke and benchmark #21281
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  • [8.19] (backport #21274) tf: configurable ec_target for smoke and benchmark #21281
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  • [8.19] (backport #21274) tf: configurable ec_target for smoke and benchmark #21281
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[elasticmachine]

💚 Build Succeeded

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• Commit: e00be16

cc @carsonip