[tidy first] remove unreachable MacroManifest building methods

[MichelleArk]

resolves #

Problem

Solution

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

sanity test search: https://github.com/search?q=org%3Adbt-labs%20create_macro_manifest&type=code

[github-actions]

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