sql: fix array decoding in COPY

[rafiss]

fixes #82792

Release note (bug fix): Fixed a bug that caused some special characters
to be misread if they were being ready by COPY ... FROM into a
TEXT[] column.

Release justification: bug fix to existing functionality.

[cockroach-teamcity]

This change is 

[otan]

lgtm! sorry we didn't get to it.

[rafiss]

tftr! merging since it looks like CI flakes

bors r+

[craig]

Build failed (retrying...):

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[craig]

Build failed (retrying...):

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[craig]

Build failed (retrying...):

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[craig]

Build succeeded:

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[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 1144e7a to blathers/backport-release-21.2-86712: 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 21.2.x failed. See errors above.

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error creating merge commit from 1144e7a to blathers/backport-release-22.1-86712: 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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