IA-3980 Earmarked stocks make campaign and round selection not mandatory

[mathvdh]

Make the campaign and round optional when creating a Earmark, and add a "temporary campaign name" text field on the model and in the front.

Related JIRA tickets : IA-3980, IA-3982

Self proofreading checklist

• Did I use eslint and ruff 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?

Changes

make the "campaign" and "round" field optional on the EarmarkedStock model and add an optional "temporary_campaign_name" charfield on the same model.

Modify the APis for that.
Modify the frontend to reflect that as well.

How to test

Try to create a earmarked stock without campaign or round using the dashboard.

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fix: empty instance pop up

Refs: IA-3665

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[quang-le]

I'm not sure it wouldn't be better to also have a temporary round. Maybe double-check this with PM.

Also there's a mean bug with the validation of the dialog:

Screen.Recording.2025-03-05.at.11.54.57.mov