feat: Merge scan tasks in flotilla

[colin-ho]

Changes Made

Related Issues

Checklist

• [ ] Documented in API Docs (if applicable)
• [ ] Documented in User Guide (if applicable)
• [ ] If adding a new documentation page, doc is added to docs/mkdocs.yml navigation
• [ ] Documentation builds and is formatted properly (tag @/ccmao1130 for docs review)

[codecov[bot]]

Codecov Report

:x: Patch coverage is 58.57143% with 29 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 75.95%. Comparing base (858cfa3) to head (53ebf72). :warning: Report is 397 commits behind head on main.

Files with missing lines	Patch %	Lines
.../daft-distributed/src/pipeline_node/scan_source.rs	58.57%	29 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5032      +/-   ##
==========================================
- Coverage   75.98%   75.95%   -0.03%     
==========================================
  Files         941      941              
  Lines      129461   129520      +59     
==========================================
+ Hits        98366    98377      +11     
- Misses      31095    31143      +48     

Files with missing lines	Coverage Δ
.../daft-distributed/src/pipeline_node/scan_source.rs	53.71% <58.57%> (+2.89%)	:arrow_up:

... and 10 files with indirect coverage changes

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