Added new migration to increase length on self assessment tbl

[ynhemanth]

JIRA link

DLSV2-424

Description

Added new migration to increase SignOffRequestorStatement and SignOffSupervisorStatement fields length from nvarchar(1000) to nvarchar(2000) on Selfassessment table

Screenshots

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Developer checks

(Leave tasks unticked if they haven't been appropriate for your ticket.)

I have:

• Run the formatter and made sure there are no IDE errors.
• Written tests for the changes (accessibility tests, unit tests for controller, data services, services, view models, etc)
• Manually tested my work with and without JavaScript. Full manual testing guidelines can be found here: https://softwiretech.atlassian.net/wiki/spaces/HEE/pages/6703648740/Testing
• Updated/added documentation in Swiki and/or Readme. Links (if any) are below:
  • doc_1_here
• Updated my Jira ticket with information about other parts of the system that were touched as part of the MR and have to be sanity tested to ensure nothing’s broken.
• Scanned over my own MR to ensure everything is as expected.

[kevwhitt-hee]

Looks good but only adjusts the length of one of the two fields specified.
Also, please could you update the description of the PR (it has placeholder text at the moment).
Thanks

[kevwhitt-hee]

I've approved this, though it's not ideal. Changes being made to address one ticket should really have been done in one migration rather than two separate ones but it won't matter as a one-off.