chore: make cargo-near-build optional in manifest

[dj8yfo]

this is merely sync with its not being used outside of cargo module : https://github.com/near/near-workspaces-rs/blob/main/workspaces/src/lib.rs#L10

[dj8yfo]

@race-of-sloths include

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Reviewer	Score
@frol	2

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[dj8yfo]

formatted with taplo

[frol]

@race-of-sloths score 2