Address the "unlimited string length" code inspection warning

[dougwaldron]

See: Code Inspection: Possible performance issues caused by unlimited string length | JetBrains Rider Documentation

[dougwaldron]

EntityFramework.ModelValidation.UnlimitedStringLength

Emitted for:

• [x] ApplicationUser.AzureAdObjectId
• [x] ComplaintAction.Comments
• [x] Complaint.CallerName
• [x] Complaint.CallerRepresents
• [x] Complaint.ComplaintNature
• [x] Complaint.ComplaintLocation
• [x] Complaint.ComplaintDirections
• [x] Complaint.ReviewComments
• [x] Complaint.DeleteComments
• [x] EmailLog.*

But also consider:

• [x] ComplaintTransition.Comment

[dougwaldron]

EmailLog will be fixed when #681 is implemented.

[dougwaldron]

Useful query:

select top 3 Id,
             len(ComplaintNature) as Length,
             ComplaintNature
from Complaints
order by len(ComplaintNature) desc;