Workspace app service SKU as top level parameter

[tamirkamara]

Fixes #2085

What is being addressed

Sometimes we like to change the default AppService Plan SKU that is deployed (like due to Azure capacity issues).

How is this addressed

• Add the sku param in all places so that the api (and ui) will pick it up
• reference the providers.tf file in porter's TF mixin for better caching

[github-actions]

Unit Test Results

2 tests   - 20   2 ✔️  - 20   1h 18m 58s ⏱️ + 1h 18m 49s
1 suites ±  0   0 💤 ±  0 
1 files   ±  0   0 ❌ ±  0 

Results for commit 3d2878a. ± Comparison against base commit bff9a7e.

This pull request removes 22 and adds 2 tests. Note that renamed tests count towards both.

test_provisioned_health_api ‑ test_health
test_shared_service_templates ‑ test_get_shared_service_template[tre-shared-service-firewall]
test_shared_service_templates ‑ test_get_shared_service_template[tre-shared-service-gitea]
test_shared_service_templates ‑ test_get_shared_service_template[tre-shared-service-nexus]
test_shared_service_templates ‑ test_get_shared_service_templates[tre-shared-service-firewall]
test_shared_service_templates ‑ test_get_shared_service_templates[tre-shared-service-gitea]
test_shared_service_templates ‑ test_get_shared_service_templates[tre-shared-service-nexus]
test_workspace_service_templates ‑ test_create_workspace_service_templates
test_workspace_service_templates ‑ test_get_workspace_service_template[tre-service-azureml]
test_workspace_service_templates ‑ test_get_workspace_service_template[tre-service-devtestlabs]
…

test_workspace_services ‑ test_create_guacamole_service_into_aad_workspace
test_workspace_services ‑ test_create_guacamole_service_into_base_workspace

♻️ This comment has been updated with latest results.

[tamirkamara]

/test-force-approve
tested in the branch workflow to run both extended and extended_aad tests.

[github-actions]

🤖 pr-bot 🤖

✅ Marking tests as complete (for commit 3d2878a)

(in response to this comment from @tamirkamara)