PR #108047 - sql: emit NOTICEs when implicitly dropping indexes

[cockroach-teamcity]

Exalate commented:

Related PR: cockroachdb/cockroach#108047
Commit: cockroachdb/cockroach@5ec47b2
Fixes: CRDB-29759
Informs: CRDB-29759

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Release note (sql change): NOTICEs are now emitted for each index
dropped by an ALTER TABLE ... DROP COLUMN ... statement.

Jira Issue: DOC-8511