Emoji can used in submissions, calculations in the xlsform, currently it's breaking either transparently removing the emoji from the answer, or visibly enketo integration (invalid char error)

Related JIRA tickets : IA-3401

Self proofreading checklist

• Did I use eslint and black formatters
• Is my code clear enough and well documented
• Are my typescript files well typed
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests
• Documentation has been included (for new feature)

Doc

• Tell us where the doc can be found (docs folder, wiki, in the code...)

Changes

fixes the way we parse xml and mutate the xml for enketo
to support emoji

How to test

1. start iaso with enketo, seed

docker compose -f docker-compose.yml -f docker/docker-compose-enketo.yml up
docker compose run --rm iaso manage seed_test_data --mode=seed --dhis2version=2.40.4.1

2. then create a new form (demo emoji)
3. create a version and upload the xlsfile
4. create a submission
5. edit the submission
6. verify the content

Print screen / video

Notes

The fix_emoji is just black magic... but works.
Thanks to the one who wrote it.