Set slot and env in tx batch specific cache

[pgarg66]

Problem

The transaction batch specific cache sometimes doesn't have the slot and environment set correctly. It's currently not a problem, as it's missing during error scenario, and is never used. But, for future proofing, it should be correctly set.

Summary of Changes

Set the slot and environment in the returned cache object.

Fixes #

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 81.7%. Comparing base (6ee3bb9) to head (b9fc4f5).
Report is 21 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #35377    +/-   ##
========================================
  Coverage    81.7%    81.7%            
========================================
  Files         834      834            
  Lines      224299   224818   +519     
========================================
+ Hits       183361   183862   +501     
- Misses      40938    40956    +18