build: reorder type_asserts.go using Python

[tarilabs]

Description

• restore gen_type_asserts to avoid regex (restores example)
• use Python for re-ordering without regex

How Has This Been Tested?

change openapi.yaml and make

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• The developer has manually tested the changes and verified that the changes work.
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If you have UI changes

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• Included any necessary screenshots or gifs if it was a UI change.
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wdyt @isinyaaa ?

[google-oss-prow]

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[tarilabs]

closing this in favour of #403