x/tools/go/analysis/passes/errorsas: also modernize errors.As -> errors.AsType

[aclements]

#51945 adds a new errors.AsType API that supersedes all or at least many uses of the existing errors.As API. We should add a modernizer to rewrite errors.As to errors.AsType.

There’s some discussion of where errors.AsType may be less clear than errors.As here: #51945 (comment)

[jub0bs]

Related: #75698

I carried out all changes manually (i.e. without any modernizer), though.

[gabyhelp]

Related Issues

• proposal: errors: Add generic errors.As #53045 (closed)
• x/tools/go/analysis/passes/errorsas: support errors.As provided by other packages #44784
• errors: AsType (As with type parameters) #51945 (closed)
• proposal: errors: Fix errors.As to support more ergonomic usage with matching typed Errors #73461 (closed)

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