feat: added capability to toggle create_project_sa

[kwong]

fixes #109

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[comment-bot-dev]

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[kwong]

@googlebot I signed it!

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[kwong]

@googlebot I fixed it.

[bharathkkb]

Thanks for the PR @kwong

[morgante]

@bharathkkb @rjerrems This is an example of a case where we probably should just set the value to false instead of exposing it as a variable.

(Not a huge deal, just want to use it as an example.)

[bharathkkb]

@morgante makes sense, I missed that from the issue. Opened #126 since we dont have a use for the PF SA anyway.