Refactoring the Examples folder

[tombuildsstuff]

This PR refactors the Examples folder in several ways:

• Examples are now grouped by Resource Type
• Examples now follow a convention where only the bare minimum of variables are used (generally prefix and location; although alt_location, kubernetes_client_id and kubernetes_client_secret are also used)
• (Almost) all examples can now be run as Acceptance Tests using this framework (a few which haven't been refactored have a .skip-test file, which means these won't be tested)
• Removes some examples which no longer make sense (e.g. the Wordpress example's been replaced by a PHP App Service, since this is what the Azure Docs suggest)

Given this is refactoring the folder fairly substantially, I'd suggest it'd probably easiest to view the result in the examples folder in the GitHub UI: https://github.com/terraform-providers/terraform-provider-azurerm/tree/f/examples/examples

It's also possible to run the Acceptance Test for the Examples like so (although getting each example passing is a separate job):

$ TF_EXAMPLE_TEST=1 ARM_TENANT_ID=00000000-0000-0000-0000-000000000000 ARM_SUBSCRIPTION_ID=00000000-0000-0000-0000-000000000000 ARM_ENVIRONMENT=public ARM_LOCATION=westeurope ARM_CLIENT_ID=00000000-0000-0000-0000-000000000000 ARM_CLIENT_SECRET=00000000-0000-0000-0000-000000000000 go test -v ./examples/

[ghost]

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