2.11 Release: Student partner self declare: Update field validation

**Describe the task**
Update the field validation to positive integers (1 - 1000000)
For student and supporting user

**Acceptance Criteria**
- [ ] Change field validation to "1 - 1000000"
- [ ] Check the equivalent field in FT app for BC income assistance

**Additional context**
- Current field validation is between 0 - 99,999,999
- If below 1 or < 1000000 then "The number you have entered is outside the expected range."
- Negative numbers trigger warning - ok

From comments below:
General rule:
Income fields should be >= 0
Currency fields where students indicate they do have this specific cost or resource should be > 0

Ref #4414
TC 1815