release-23.1: ttljob: add hint to use PK in delete/select query

[blathers-crl]

Backport 1/1 commits from #118318 on behalf of @rafiss.

/cc @cockroachdb/release

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This will help avoid choosing a plan that scans a secondary index, which can lead to many KV rows being scanned and also lead to contention.

This updates the query used for both SELECTs and DELETEs so that they
use the primary index.

informs #82140

Release note (bug fix): Fixed a bug that could cause DELETE queries sent by the row-level TTL job to use a secondary index rather than the primary index to find the rows to delete. This could lead to some DELETE operations taking a much longer time than they should. This bug was present since v22.2.0.

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Release justification: bug fix

[blathers-crl]

Thanks for opening a backport.

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[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is 

[yuzefovich]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @annrpom and @michae2)

[rafiss]

i decided to just update the commit message