Remove python scripts/dependencies from iOS directory

[faern]

So, if I run the vulnerability scanner osv-scanner on our repository. It points out that ios/requirements.txt has a vulnerable version of gdal in it: https://osv.dev/vulnerability/PYSEC-2022-43065.

Upon further investigation my conclusion is that ios/requirements.txt has a lot of stuff in it that we don't actually need. As far as I understand, our only iOS python code is ios/update_translations.py, and this script only depends on nslocalized. nslocalized in turn only depend on six. So the remaining entries in requirements.txt seem to be just noise.

My theory on why they ended up there in the first place is that by default pip freeze that generate these files generate a list of all globally installed python packages. Or all packages installed in a venv if one is active. And the person generating this lockfile probably had a lot more packages installed than the ones purely needed for update_translations.py.

Can you please verify my assumptions by trying to use this script in whatever ways you usually do, but isolated to a venv with only the things from my updated requirements file are installed?

python3 -m venv ./python_env
source python_env/bin/activate
pip3 install -r requirements.txt

python3 update_translations.py

EDIT: Turns out we don't use this script at all. So the PR changed into just removing it altogether. Later, when we want to introduce translations, we can resurrect it if we feel like this solution is the best way to go. But we should also consider writing such tooling in other languages that we already use, to keep the tech stack a bit narrower.

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This change is 

[faern]

Reviewable status: 0 of 2 files reviewed, all discussions resolved

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.github/workflows/verify-locked-down-signatures.yml line 13 at r1 (raw file):

      - ci/keys/**
      - ci/verify-locked-down-signatures.sh
      - ios/requirements.txt

All lockfiles, or all files that affect supply chain security, must be listed here. Changes to them are not allowed by third parties, and commits changing them must be signed.

[faern]

I now changed this PR to remove the iOS python script altogether. I learned that we never use it, and have no concrete plans to use it in the short term.

Whenever we implement translations, we should evaluate if we can use a different language than python to do this type of task, if it's still needed by then.

[buggmagnet]

Reviewed 3 of 3 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[buggmagnet]

nice job !

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved