all: replace calls to errors.As with errors.AsType

[apocelipes]

This is a follow-up for CL 708495.

Updates #51945

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[gopherbot]

Message from Carlana Johnson:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from kyose chang:

Patch Set 2:

(1 comment)

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This PR (HEAD: 59a6cc8) has been imported to Gerrit for code review.

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[gopherbot]

Message from kyose chang:

Patch Set 3:

(1 comment)

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