fix(azurerm_log_analytics_workspace_table): Parse subscriptionId from workspaceId

[xescab]

Subscription ID used to manage tables should be the same as the Log Analytics Workspace.

Fixes #27564

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Description

Resource group for the Log Analytics Workspace should be looked at in correct subscription, as the subscription ID
is present in workspace_id variable, and the table retention should be updated correctly.

When the Log Analytics Workspace has been created previously in another subscription, the Terraform code fails, as explained in #27564.

module.diagnostic_settings.azurerm_monitor_diagnostic_setting.diag[0]: Creation complete after 14s [id=/subscriptions/xxxx-xxxx-x7aa/resourceGroups/rg-test-7fc24b/providers/Microsoft.KeyVault/vaults/kv-test-7fc24b|diag-test-7fc24b]
╷
│ Error: failed to update table Usage in workspace log-test-7fc24b in resource group rg-test-csz-7fc24b: performing CreateOrUpdate: unexpected status 404 (404 Not Found) with error: ResourceGroupNotFound: Resource group 'rg-test-csz-7fc24b' could not be found.
│
│   with module.diagnostic_settings.azurerm_log_analytics_workspace_table.table["Usage"],
│   on ../../main.tf line 37, in resource "azurerm_log_analytics_workspace_table" "table":
│   37: resource "azurerm_log_analytics_workspace_table" "table" {
│
│ failed to update table Usage in workspace log-test-7fc24b in resource group rg-test-csz-7fc24b: performing CreateOrUpdate: unexpected status 404 (404 Not Found) with error: ResourceGroupNotFound: Resource group 'rg-test-csz-7fc24b' could not be found.

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Change Log

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• azurerm_log_analytics_workspace_table - Correctly parse subscriptionId from workspaceId [azurerm_log_analytics_workspace_table looks for resource group in wrong subscription #27564]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27564

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[katbyte]

Thanks @xescab - LGTM ⛈️