[TestCase] Fix TestAccDashboardGrafana_withSku

[neil-yechenwei]

Recently TestAccDashboardGrafana_withSku is failed with below error so that I submitted this PR to fix it.

Error Message returned by API:

performing GrafanaCreate:
unexpected status 400 with error: SkuNotSupported: The Grafana Workspace sku
name 'Essential' is not a supported value. Supported sku values are: Standard

Below is the test result after the fix is applied.

[stephybun]

@neil-yechenwei this sku was added just 2 weeks ago and is also available in the portal. This could be region specific or there's an issue with the API, can you please find out which is the case?

[neil-yechenwei]

@stephybun , it's weird. The "essential" value was removed from this commit #24014. I add it back and change the test location. Now test case passed. Thanks.

[katbyte]

LGTM 🔄

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