fix deprecation firing for microbatch model w custom strategy

[MichelleArk]

Resolves #10994

Problem

The deprecation about custom microbatch macros was being fired in the wrong instances. It was being fired a custom marcro wasn't present instead of when it was 🫠

Solution

Negate the conditional check of self.manifest._microbatch_macro_is_core

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 or 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.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.05%. Comparing base (89caa33) to head (82a093a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10989      +/-   ##
==========================================
- Coverage   89.10%   89.05%   -0.05%     
==========================================
  Files         183      183              
  Lines       23626    23626              
==========================================
- Hits        21051    21040      -11     
- Misses       2575     2586      +11     

Flag	Coverage Δ
integration	86.35% <100.00%> (-0.05%)	⬇️
unit	62.79% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	62.79% <0.00%> (ø)
Integration Tests	86.35% <100.00%> (-0.05%)	⬇️

[MichelleArk]

✅

[QMalcolm]