Remove redundant site extension fix

[JunTaoLuo]

Missed the revert of an earlier fix in #27841.

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[JunTaoLuo]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[Pilchie]

@BrennanConroy @jkotalik - do you know if we need this for 5.0.1?

[BrennanConroy]

I assume this was just adding extra files to the package that should have no effect on users.

Since it was accidentally added in 5.0.1 I think removing it in 5.0.1 is fine.

[jkotalik]

I think we should try getting this into 5.0.1

[jkotalik]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[dougbu]

This is good cleanup but the timing isn't critical. @JunTaoLuo is removing a confusing mention of files that no longer exist and never shipped in any package.

[dougbu]

BTW, the not-in-any-package part is because @(_TemplateFiles) become part of a generated project, not directly part of a package.

[JunTaoLuo]

FYI, I'll withhold this cleanup PR for the next servicing release since it's not urgent.