Updated inv_ex function in torch frontend

[rohitsalla]

the current inv_ex function had a TODO task as TODO: info should return an array containing the diagonal element of the . i have rewritten the task

[github-actions]

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[Ishticode]

closing this as the changes at the moment are the same as #28724 with the same undefined variable errors. Please feel free to reopen if there is a distinct goal here. Thanks :)