68567: colrpc: enhance warnings from the outbox r=yuzefovich a=yuzefovich

This commit marks several string constants as "safe" from the
redactability perspective so that the warnings logged by the outboxes
are more helpful. Additionally, several minor nits around error
formatting are addressed.

Release note: None

68675: sql: implement IterateStatementStats() for PersistedSQLStats r=maryliag a=Azhng

Depends on: #68555, #68620
Related to: #64743

Previously, IterateStatementStats() for PersistedSQLStats was
left unimplemented and it defaults to the implementation of
SQLStats.IterateStatementStats(). This means calls to
IterateStatementStats() on PersistedSQLStats cannot read
the statement statistitcs stored in system table.

This commit implements the IterateStatementStats() through
the new CombinedStmtStatsIterator which enables this method
to read both in-memory and persited statement statistics.

Release note: None

68738: sql/catalog/dbdesc: repair old descriptors corrupted due to DROPPED SCHEMA name r=ajwerner a=sajjadrizvi

#63119 fixes a bug that corrupts a database descriptor when a child schema was 
dropped, adding an entry in schema-info structure erroneously with database name
instead of schema name . Although the bug was fixed , there can be database backups 
with corrupted descriptors.

This commit adds a post-deserialization function to repair a corrupted descriptor. Moreover,
it adds a test function to ensure that descriptors with such corruption are fixed during
migration.
 
Release note: None
 
Fixes: #63148


68903: github: redirect KV code reviews to @cockroachdb/kv-prs r=irfansharif a=irfansharif

We try to use the @cockroachdb/kv alias for notifying the entire team on
issues. There's no way to disable notifications for github's automatic
codeowners driven review requests, and that tends to be a firehose, so
lets use this sub-team alias instead.

Release note: None

68978: changefeedccl: detect sink URLs with no scheme r=HonoreDB a=stevendanna

Previously, if a user provided a sink URL with no scheme (such as
` kafka%3A%2F%2Fnope%0A`), a changefeed job would be started. However,
this changefeed job would be writing into a bufferSink.  The
bufferSink is used by core changefeeds.

The user may have provided such a URL because of confusion over how to
URL encode their sink URL.

Now, they will receive an error such as

```
pq: no scheme found for sink URL "kafka%3A%2F%2Fnope%0A"
```

Release note (enterprise change): CHANGEFEED statements now error
if the provided sink URL does not contain a scheme. Such URLs are
typically a mistake and will result in non-functional changefeeds.

Co-authored-by: Yahor Yuzefovich <yahor@cockroachlabs.com>
Co-authored-by: Azhng <archer.xn@gmail.com>
Co-authored-by: Sajjad Rizvi <sajjad@cockroachlabs.com>
Co-authored-by: irfan sharif <irfanmahmoudsharif@gmail.com>
Co-authored-by: Steven Danna <danna@cockroachlabs.com>