Add migration to SessionError table

[CatalinVoineag]

Context

There are two types of errors the candidate can encounter when using one
login. Typical 500 errors and when a user uses the wrong email address

We need to know what error the candidate gets to redirect them to the
correct page.

Prior to this change we are redirecting the candidate to wrong_email
error page even if it's a 500 error page.

Adding a enum to the SessionError table makes it easier to
distinguish between these errors. Better than storing this information
in the session.

Problematic code, we can get here from the failure endpoint which should not redirect the user to wrong email page but to 500 page

There's a part 2 to this PR here #10299

Changes proposed in this pull request

Guidance to review

Problem that I'm trying to fix, this should go to 500

kazam_uq96hq22.movie.mp4

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, if included inform data insights team of the changes
• If this code adds a column that may include PII, the sanitise.sql script and 0025-protecting-personal-data-in-production-dump.md ADR have been updated
• API release notes have been updated if necessary
• If it adds a significant user-facing change, is it documented in the CHANGELOG?
• Attach the PR to the Trello card