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feat: add TELEM wide-routing knobs + pure decision function to bb_log (#1188)

B1-831 PR-2 of 3: adds the configuration surface and portable decision
core for gating whether a TELEM-tagged log line also fans out to the
wide sinks (bb_log_event forwarder queue, UDP mirror) beyond the
console. No hot-path wiring -- s_log_vprintf's call site lands in PR-3,
which will need its own matching #if CONFIG_BB_LOG_TELEM_ROUTING guard
around that call site (this PR's Kconfig knob genuinely gates
compilation of bb_log_telem_route.c today, but nothing calls the
function it compiles yet).

- Kconfig: BB_LOG_TELEM_ROUTING (compile gate, default y),
  BB_LOG_TELEM_TAG (string, default TELEM, depends on ROUTING),
  BB_LOG_TELEM_ROUTE_EVENTS (bool, default n, depends on ROUTING)
- components/bb_log/CMakeLists.txt only adds bb_log_telem_route.c to
  SRCS when CONFIG_BB_LOG_TELEM_ROUTING is set, mirroring the
  CONFIG_BB_LOG_UDP_SINK conditional-append idiom already in this file
- bb_log_telem_route_wide(): pure, host-testable, positively-framed
  decision function; bridges BB_LOG_TELEM_TAG the same way
  bb_log_config.c bridges BB_LOG_DEFAULT_LEVEL_STR
- 9 new host tests covering both route_events modes, non-TELEM tags,
  NULL/empty tag, and the TELEMETRY/TELE substring-confusion cases

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