chore: update samples for new auth

[codyoss]

• Remove a couple of old unused samples
• Switch apiary examples to use NewService variant or constructs that don't require users to pass a client in
• Update all refs of old auth library to new

[snippet-bot[bot]]

Here is the summary of changes.

You are about to delete 4 region tags.

• docs/appengine/googlecloudstorageclient/download.txt:1, tag GOPATH_setup
• docs/appengine/googlecloudstorageclient/download.txt:5, tag Go_install
• docs/appengine/googlecloudstorageclient/getstarted.txt:1, tag App_Engine_Example
• docs/appengine/googlecloudstorageclient/getstarted.txt:4, tag Managed_VM_Example

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[grayside]

Thanks for updating these samples Cody! Did you intend to remove several region tags?

[codyoss]

@grayside Yeah, should have called that out in the commit message. It is from the two files I deleted that were non-code and not associated with any code. I verified these relics where not being used anywhere :)