server, all: rename some cluster settings

[knz]

Fixes #75520.
Epic: CRDB-28893

The following settings have been renamed, to emphasize how the initial drain wait is a mandatory wait, whereas the others are simply timeouts.

Release note (cli change): The following cluster settings have been renamed; the previous names remain available for
backward-compatibility.

Previous name	New Name
server.shutdown.drain_wait	server.shutdown.initial_wait
server.shutdown.lease_transfer_wait	server.shutdown.lease_transfer_iteration.timeout
server.shutdown.query_wait	server.shutdown.queries.timeout
server.shutdown.connection_wait	server.shutdown.transactions.timeout
server.shutdown.jobs_wait	server.shutdown.jobs.timeout

[cockroach-teamcity]

This change is 

[rafiss]

I think we should name it server.shutdown.transaction.timeout since this logic actually waits for all open transactions (implicit or explicit) to end.

Also, out of curiosity, why server.shutdown.connections.timeout instead of server.shutdown.connection_timeout?

Another naming scheme to consider is: server.shutdown.timeout.connection, server.shutdown.timeout.lease_transfer_iteration, ``server.shutdown.timeout.transaction`, etc. In case that kind of namespace hierarchy is helpful

[knz]

RFAL

I think we should name it server.shutdown.transaction.timeout since this logic actually waits for all open transactions (implicit or explicit) to end.

Done.

Also, out of curiosity, why server.shutdown.connections.timeout instead of server.shutdown.connection_timeout?
Another naming scheme to consider is: server.shutdown.timeout.connection, server.shutdown.timeout.lease_transfer_iteration, ``server.shutdown.timeout.transaction`, etc. In case that kind of namespace hierarchy is helpful

As per the guidelines:

[rafiss]

tyvm!

[knz]

TFYR!

bors r=rafiss

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)