Move tests that use make_us_central(), set_global_tz(), ParsedTimezone,
and DSTRuleType into esphome::time::testing namespace where those symbols
are declared.
Remove the runtime POSIX TZ string parser and all associated bridge code
now that timezone data is sent as pre-parsed structs via protobuf.
Removed:
- parse_posix_tz() and internal parsing helpers (skip_tz_name, parse_offset,
parse_dst_rule, parse_uint, parse_transition_time)
- RealTimeClock::set_timezone() overloads and apply_timezone_()
- API connection fallback path for string-based timezone
Kept:
- All conversion functions (epoch_to_local_tm, is_in_dst, calculate_dst_transition)
- Internal helpers used by conversion functions
- localtime_r/localtime overrides
- Tests for all permanent functions
The regex matches `scanf (` in comments too since `\s*\(` matches the
space before the parenthesized size note.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add NOLINT for intentional global mutable state
- Simplify boolean return in parse_posix_tz
- Add USE_TIME_TIMEZONE define for tests
- Add NOLINT for Google Test SetUp/TearDown methods
