Remove upload-screenshots.py from package

[eloquence]

Status

Ready for review

Description of Changes

Fixes #5832

Uses .rsync-filter as suggested by @conorsch on #5832 (comment). We could also move the script somewhere else, but none of the existing directories (e.g., devops) felt like a great fit.

Testing

1. make build-debs-notest on this branch
2. Make a coffee, read a book, ponder the mysteries of the universe
3. Inspect securedrop-app-code package in build/focal
4. • Observe that upload-screenshots.py is no longer present.

[codecov-commenter]

Codecov Report

Merging #5941 (3e4fc07) into develop (6eb5ac8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5941   +/-   ##
========================================
  Coverage    85.37%   85.37%           
========================================
  Files           53       53           
  Lines         3876     3876           
  Branches       480      480           
========================================
  Hits          3309     3309           
  Misses         455      455           
  Partials       112      112           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6eb5ac8...3e4fc07. Read the comment docs.

[rmol]

1. make build-debs-notest on this branch
2. Make a coffee, read a book, ponder the mysteries of the universe
3. Inspect securedrop-app-code package in build/focal
4. • Observe that upload-screenshots.py is no longer present.