Remove weight text files after linmos in spectral line flow

[tjgalvin]

The channel-wise linmos procedure creates many small text files when computing the channel weights. This PR introduces a new option to remove them when linmos has completed. This required some small changes to the helper function in the linmos call.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 51.85185% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.48%. Comparing base (9946a0e) to head (75ec403).

Files with missing lines	Patch %	Lines
flint/coadd/linmos.py	51.85%	13 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
- Coverage   60.48%   60.48%   -0.01%     
==========================================
  Files          35       35              
  Lines        6135     6154      +19     
==========================================
+ Hits         3711     3722      +11     
- Misses       2424     2432       +8     

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