PR #101987 - cli/sql: new option autocerts for TLS client cert auto-discovery

[cockroach-teamcity]

Related PR: cockroachdb/cockroach#101987
Commit: cockroachdb/cockroach@dedeacf
Fixes: CRDB-27201

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Release note (cli change): The \connect client-side command for the
SQL shell (included in cockroach sql, cockroach demo,
cockroach-sql) now recognizes an option autocerts as last
argument.

When provided, \c will now try to discover a TLS client
certificate and key in the same directory(ies) as used by the previous
connection URL.

This feature makes it easier to switch usernames when
TLS client/key files are available for both the previous and the new
username.