colexec: fix mixed type comparison between Timestamp and TimestampTZ

[yuzefovich]

I believe currently there is an issue when comparing values of Timestamp type against TimestampTZ type. In the vectorized engine both are mapped to coltypes.Timestamp, so the generated code doesn't know that there are some differences. Timestamp value needs to be "shifted" into the time zone of the evaluation context before comparison whereas TimestampTZ value doesn't need to, but currently we're comparing the values as if both were TimestampTZ. This issue should fixed as part of #43559.

If we don't fix it before the release, we need to have some fallback mechanism - either remove the support for one of the types or plumb through logical types in all operators and prohibit specifically such mixed type comparison.

Jira issue: CRDB-5204

[asubiotto]

Mixed type comparisons with timestamps are disallowed after #45724

[github-actions]

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