fix(EC-22843): strict whitespace enforcement

[TimEvink]

This PR, a dependency of https://github.com/Elfsquad/cpq/pull/7086, enforces the following whitespace formatting of the sentences in the translations csv's.

• no leading or trailing whitespace characters.
• only single spaces are allowed as separators between words in a sentence.

More specifically, this PR adds a workflow (check-whitespace.yml) that runs a test (test-whitespace.py) on every pr to main of translations, passing only if the above two rules are met for all the text in the translations file.

The translations csv's are also updated to conform to this new test, and a helper script is included which I used to generate the new csv's (and could be helpful in case of manual intervention later on).

Finally some small changes to existing scripts/workflows:

• the use of exit(0) and exit(1) in python is a bit fragile (although it works for now), but using sys.exit is more stable.
• updated checkout versions.
• the checkouts of the repo do not need any git history so we can set the fetch-depth to 1.

[minardus]

🔥