53263: util/logs: request redactable logs by default  r=irfansharif a=knz

First two commits from  #53313

This changes the default value for the `--redactable-logs` flag to
`true`. This makes server produce redactable logs by default.

Note that `--redactable-logs` only triggers redactable logs if the
caller calls `SetupRedactionAndStderrRedirects()`. This is done by
e.g. the server code. This means that even with this patch,
*unit tests* continue to produce non-redactable logs.

This commit also adds telemetry for the enablement of redactable
markers, as `server.logging.redactable_logs.{enabled,disabled}`.

Fixes #51834.


Release note (cli change): The `cockroach start`, `start-single-node`
and `demo` command now enable `--redactable-logs` by default.
This causes log files to become redactable, so that 
`cockroach debug merge-log --redact` or `cockroach debug zip --redact`
can remove sensitive information out of log files.
(Reminder: `cockroach debug zip --redact` only affects *log files*;
other items collected by the command can still contain sensitive information)

53295: kvserver: fix race in rangefeed processor setup r=nvanbenschoten a=ajwerner

Fixes #53183

Release note: None

Co-authored-by: Raphael 'kena' Poss <knz@thaumogen.net>
Co-authored-by: Andrew Werner <ajwerner@cockroachlabs.com>