Wrap MCP script with bash script to check for powershell

[JennyPng]

WIP test for wrapper script around the azure-sdk-mcp.ps1 script
need to investigate better solution for cross-platform, as .sh doesn't work well on Windows

Would close #13716

• Provide Powershell install instructions to the user if they cannot start the MCP server due to missing Powershell

requires updating mcp.jsons to:

  "command": "bash",
      "args": ["${workspaceFolder}/eng/common/mcp/azure-sdk-mcp.sh", "-Run"]

example output when pwsh is not detected (run on Ubuntu):

[azure-sdk]

The following pipelines have been queued for testing:
java - template
java - template - tests
js - template
net - template
net - template - tests
python - template
python - template - tests
You can sign off on the approval gate to test the release stage of each pipeline.
See eng/common workflow