terraform: indirect dependency to a Deprecated extension

[jeanpierrecamalot]

in the definition of terraform feature src/terraform/devcontainer-feature.json, there is a reference to the extension ms-azuretools.vscode-azureterraform
Which is in turn dependant of ms-vscode.azure-account
that extension has been deprecated
Action : remove extension ms-azuretools.vscode-azureterraform from src/terraform/devcontainer-feature.json