[release-18.0] bugfix: don't treat join predicates as filter predicates (#16472)

[vitess-bot]

Description

This is a backport of #16472

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

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Backward compatibility

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[vitess-bot]

Hello @systay, there are conflicts in this backport.

Please address them in order to merge this Pull Request. You can execute the snippet below to reset your branch and resolve the conflict manually.

Make sure you replace origin by the name of the vitessio/vitess remote

git fetch --all
gh pr checkout 16473 -R vitessio/vitess
git reset --hard origin/release-18.0
git cherry-pick -m 1 59408f95e1b3c1b0952deae2b891fcab18e1443e