upgrades: fix idempotence issue in system table role id migrations

[andyyang890]

This patch fixes an idempotence issue in the role id migrations for
the system.users and system.role_options tables.

Fixes #91449

Release note: None

[cockroach-teamcity]

This change is 

[andyyang890]

Depends on #91755

[ajwerner]

Reviewed 2 of 2 files at r4, all commit messages.
Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @rafiss)

[ajwerner]

make sure to backport this to 22.2

[rafiss]

Reviewed 3 of 5 files at r3, 2 of 2 files at r4, all commit messages.
Reviewable status: complete! 1 of 0 LGTMs obtained (waiting on @andyyang890)

[andyyang890]

bors r=ajwerner,rafiss

[craig]

Build failed:

• Bazel Essential CI (Cockroach)

[andyyang890]

test flakes

bors r=ajwerner,rafiss

[craig]

Build succeeded:

• Bazel Essential 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 b8ca64f to blathers/backport-release-22.2-91756: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 403 Resource not accessible by integration []

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

Backport to branch 22.2.x failed. See errors above.

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