add option to save batches to differnt location for manager live

[peterdudfield]

Pull Request

Description

For https://github.com/openclimatefix/nowcasting_forecast/issues/59 Option to save batches in ManagerLive

Fixes #

How Has This Been Tested?

added to unittest

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov-commenter]

Codecov Report

Merging #662 (25668e6) into main (f1ad254) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #662   +/-   ##
=======================================
  Coverage   93.25%   93.25%           
=======================================
  Files          47       47           
  Lines        3200     3204    +4     
=======================================
+ Hits         2984     2988    +4     
  Misses        216      216           

Impacted Files	Coverage Δ
nowcasting_dataset/manager/manager_live.py	91.78% <100.00%> (+0.47%)	:arrow_up:

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