SNOW-2912540: decouple LocalTestOOBTelemetryService from connector.telemetry_oob - #4309

The decoupling from connector.telemetry_oob ported add()/flush()/enable()/
disable() but missed size() (connector/telemetry_oob.py:542,
`return self.queue.qsize()`), which several tests
(tests/mock/test_oob_telemetry.py, tests/mock/test_multithreading.py) call
directly on the service instance.

mock/_telemetry.py imported snowflake.connector.secret_detector.SecretDetector
unconditionally -- the only reason UD PR #598 ports SecretDetector into the
Universal Driver at all is to satisfy this one Snowpark import (SecretDetector
is not otherwise used or maintained by UD). Per BehaviorDifferences.yaml #45,
OOB telemetry is disabled on the backend anyway, so this masking is
defense-in-depth on the outbound payload, not a response to active
exploitation -- but export_queue_to_string() feeds a real
requests.Session().post() to a live analytics endpoint, so it's not a safe
no-op either.

Ports only what _telemetry.py actually calls (mask_secrets -> masked string),
from UD's actual _common/secret_detector.py source (PR #598) rather than the
older, less complete real v4 connector's version -- verified UD's copy has
3 additional maskers (OAuth tokens, OAuth client secrets, passcodes) plus a
PASSWORD_PATTERN false-positive fix and a wire-format fix to
CONNECTION_TOKEN_PATTERN, all needed for correctness. Drops everything that
exists solely for UD's backward-compat contract: @backward_compatibility,
MaskedMessageData's 3-tuple return (only masked_text is ever read),
logging.Formatter inheritance, and the classmethod-vs-staticmethod workaround.

Fixes the exception-handling branch rather than porting it straight: the
legacy/UD code does masked_text = str(ex) on failure, which can leak
exception-reflected input. Returns a static sentinel instead -- this was
already flagged as a real finding by the security bot on UD #598.

After this, mock/_telemetry.py has zero remaining imports from
snowflake.connector.

Test coverage: ported every behavioral test from UD PR #598's
test_secret_detector.py TestMaskSecrets class (27 cases via pytest count),
adapted from the 3-tuple/class-method API to the plain-function API here,
plus one exception-handling test adapted to assert the static sentinel
instead of the leaked exception text. Dropped TestFormatter and the
logging.Formatter-specific exception tests -- not applicable, since
mask_secrets is a plain function here, not a logging.Formatter subclass.

Corrects the previous commit: this is now an exact copy of UD's
_common/secret_detector.py (drivers#598), not a collapsed rewrite. Keeps the
SecretDetector class, MaskedMessageData, the (is_masked, masked_text, err_str)
3-tuple return, classmethods, logging.Formatter inheritance, format(),
create_formatting_error_log(), and masked_text = str(ex) on failure --
unchanged, even though the str(ex) behavior is a known real finding (flagged
by the security bot on UD #598); fixing it is a separate call for whoever
reviews this, not bundled into a move.

Only removed what's physically impossible to keep: @backward_compatibility,
install_backward_compatibility_getattr and its import, and the trailing
install_backward_compatibility_getattr(__name__) call -- none of that
mechanism exists in snowpark-python. The mask_secrets() docstring explaining
why the maskers are classmethods (to survive @backward_compatibility
stashing the class out of module globals) is left as-is even though that
rationale no longer applies here -- not silently deleted or rewritten as
part of this move.

_telemetry.py's call site goes back to unpacking the 3-tuple unmodified;
test_secret_detector.py is now a full copy of UD's test suite (TestMaskSecrets,
TestMaskSecretsExceptionHandling, TestFormatter), not just the masking-behavior
subset -- format()/logging.Formatter are kept, so their tests are too.

…912540-decouple-oob-telemetry

Co-authored-by: Filip Pawłowski <sfc-gh-fpawlowski@users.noreply.github.com>

…912540-decouple-oob-telemetry

Co-authored-by: Filip Pawłowski <sfc-gh-fpawlowski@users.noreply.github.com>

…912540-decouple-oob-telemetry