No need to double-zip

[mike-schenk]

@danielle-casella-adams

.github/workflow-templates/im-deploy-tf-manually-apply-to-dev-subscription.yml

Lines 144 to 145 in 9e03dbf

	Add-Type -Assembly "System.IO.Compression.FileSystem"
	[System.IO.Compression.ZipFile]::CreateFromDirectory("plans", $terraformPlanName)

A Terraform plan file is already a ZIP archive. Zipping it again won't do much.

[danielle-casella-adams]

The code to upload/down from the az storage account was taken directly from the octopus step template. I made some changes to upload the tfplan directly and then use the downloaded file and terraform complains about it not being a valid zip file. We can make this change but it will have to be once we have more time to look at it.