Add to support for MIRACLE LINUX 8 and 9 to agent.py and check_os.py

[mikazo777]

I want to deploy azure monitor agent for MIRACLE LINUX 8 and 9 on Azure.These images are released at the following sites.

https://azuremarketplace.microsoft.com/ja-jp/marketplace/apps/miraclelinux.miracle-linux-9-0-rc
https://azuremarketplace.microsoft.com/ja-jp/marketplace/apps/miraclelinux.miraclelinux-8-6

But, deploying is failed.

The following error message is displayed.
{"code":"DeploymentFailed","message":"At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.","details":[{"code":"Conflict","message":"{\r\n \"status\": \"Failed\",\r\n \"error\": {\r\n \"code\": \"ResourceDeploymentFailure\",\r\n \"message\": \"The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.\",\r\n \"details\": [\r\n {\r\n \"code\": \"VMExtensionHandlerNonTransientError\",\r\n \"message\": \"VM 拡張機能の種類 'Microsoft.Azure.Monitor.AzureMonitorLinuxAgent' のハンドラーで VM 拡張機能 'AzureMonitorLinuxAgent' のターミナル エラーが報告されました。エラー メッセージ: '[ExtensionOperationError] Non-zero exit code: 51, /var/lib/waagent/Microsoft.Azure.Monitor.AzureMonitorLinuxAgent-1.28.8/./shim.sh -install\\n[stdout]\\n2023/10/20 02:49:42 [Microsoft.Azure.Monitor.AzureMonitorLinuxAgent-1.28.8] Install,failed,51,Unsupported operating system: miraclelinux 9.0\\n\\n\\n[stderr]\\n'。\\r\\n \\r\\n'Install handler failed for the extension. More information on troubleshooting is available at https://aka.ms/vmextensionlinuxtroubleshoot'\"\r\n }\r\n ]\r\n }\r\n}"}]}
I think agent.py and check_os.py need to be add 'miracle' in servral places.