sql, pgwire: Add SEVERITY_NONLOCALIZED error field

[e-mbrown]

Resolves #81794

Release note (sql change): We now send the Severity_Nonlocalized field
in the pgwire Notice Response.

[cockroach-teamcity]

This change is 

[rafiss]

the code looks good! could you update the tests with

./dev test pkg/sql/pgwire --filter='TestPGTest/notice' --rewrite

also, can you make the release note be (sql change) and mention that we now send the SeverityUnlocalized field in the pgwire NoticeResponse.

[rafiss]

oh interesting, didn't realize this would need to change

the important thing about proto definitions is that the order matters. if you change the order, it changes how the object is serialized, which means code that is using the old definition won't know how to deserialize it

so, you need to make severity_nonlocalized be at number 10

[e-mbrown]

Just realized this was left over code I meant to remove.

[rafiss]

lgtm!

[e-mbrown]

bors r+

[craig]

Build succeeded:

• GitHub CI (Cockroach)

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from ea6ded2 to blathers/backport-release-22.1-82677: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 22.1.x failed. See errors above.

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