Rename internal batch_info variable to previous_batch_results

[QMalcolm]

Problem / Solution

We were using batch_info to store the information on previous batch execution (if available) at runtime. However this name is confusing. Thus, we're renaming it to something more applicable, previous_batch_results. This is a non-dangerous change because batch_info wasn't written out as part of any artifacts.

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 86.42%. Comparing base (a42303c) to head (4050e37).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11056      +/-   ##
==========================================
- Coverage   89.15%   86.42%   -2.73%     
==========================================
  Files         183      183              
  Lines       23764    23767       +3     
==========================================
- Hits        21186    20541     -645     
- Misses       2578     3226     +648     

Flag	Coverage Δ
integration	86.42% <100.00%> (-0.11%)	⬇️
unit	?

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

Components	Coverage Δ
Unit Tests	86.42% <100.00%> (-2.73%)	⬇️
Integration Tests	86.42% <100.00%> (-0.11%)	⬇️