Allow candidate to edit work histories

[CatalinVoineag]

Context

We want to allow the candidate to edit their work histories, this will only edit work experiences, volunteering_experiences and work history breaks on the application form.

The application choices that are submitted will still have the old work histories. This is because each submitted application choice has its own work history.

So the user will be able to edit their work histories but only for new application choices.

Changes proposed in this pull request

Guidance to review

Things to check

• [ ] If the code removes any existing feature flags, a data migration has also been added to delete the entry from the database
• [ ] This code does not rely on migrations in the same Pull Request
• [ ] If this code includes a migration adding or changing columns, it also backfills existing records for consistency
• [ ] If this code adds a column to the DB, decide whether it needs to be in analytics yml file or analytics blocklist
• [ ] API release notes have been updated if necessary
• [ ] If it adds a significant user-facing change, is it documented in the CHANGELOG?
• [ ] Required environment variables have been updated added to the Azure KeyVault
• [ ] Inform data insights team due to database changes
• [ ] Make sure all information from the Trello card is in here
• [ ] Rebased main
• [ ] Cleaned commit history
• [ ] Tested by running locally
• [ ] Add PR link to Trello card