azurerm_windows_web_app, azurerm_windows_web_app_slot - add node 18 support and fix node version not being set issue.

[xiaxyi]

fix #19289

For windows web app, we need to add the key WEBSITE_NODE_DEFAULT_VERSION in app_setting block to save the node version.

For linux web app, this key is not necessary as linux web app using linuxFxVersion to save the version information.

[jackofallops]

Closing as superseded by 19685

[0gust1]

#19685 (for readers)

[github-actions]

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