* CLDC-853 Added hard validations for sales income2
* CLDC-853 Added soft validation for sales income2
* CLDC-853 Fix tests broken by new code
* CLDC-853 Add new tests for new page and refactor slightly
* CLDC-853 Fix linting errors
* CLDC-853 Rename migration and update schema version
* CLDC-853 Fix broken sales income2 test
* CLDC-853 Rename migration
* CLDC-853 Move income 2 to cya card 2 and commonise combined income validation
* CLDC-853 Actually use the validate_combined_income method
* combine duplicate methods after rebase, ensure hard validations are triggered on all relevant fields
* move validation on child income to financial validations to stop it being triggered on lettings logs, minor amendments to tests broken by changes
* revamp financial validations tests against income to reflect updates
* amend child income validation to reflect specifications and write tests to cover this validation
* correct linting errors and play a little code golf
* change copy for some validations, add sales log method and amend interruption screen helper to support this
* extract duplicate code to private method
* update buyer 1 and 2 income value check to be consistent
* remove ecstat from income checks, the only ecstat we care about is child which is dealt with elsewhere
* rename constant struct with same anme as existing variable
* amend tests to reflect the chagnes in validations and copy
* enable currency formatting of numbers for inserting into informative_text or title_text
* update evil test in form handler spec
* rebase and fix conflicts and tests
* change a variable name and correct minor rebase errors
* update interruption screen helper tests
* correct linting errors, minor test failure and typo
* add tests for new sales log method for formatting currency
* fix merge conflicts
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Co-authored-by: Arthur Campbell <arfa.camble@gmail.com>
David May-Miller