cmd/go/internal/modload: don't infer a /v1 suffix module path

[chenyanchen]

Ensure that the module path inferred by go mod init matches the condition of go mod init [module-path].

Fixes #73121

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Patch Set 1:

(1 comment)

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Message from Yanchen Chen:

Patch Set 1:

(2 comments)

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Message from Sean Liao:

Patch Set 1:

(2 comments)

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Message from Yanchen Chen:

Patch Set 1:

(2 comments)

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