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'buck2_server/cmd/ctx': Remove most anyhow usage

Summary: Migrates most uses of `anyhow` in the crate to `buck2_error`. Only a starlark function was skipped and will be dealt with later

Reviewed By: JakobDegen

Differential Revision: D66367353

fbshipit-source-id: 1073ac07c262d633d69e089923baaff35e0be3f6