Convert findMy + duetLocations to LAVA @artifact_processor

[abrignoni]

Modernizes two location standalones to the LAVA pipeline (context form, UTC, get_relative_path).

findMy.py

• v1 __artifacts__ → __artifacts_v2__; @artifact_processor single-arg context form.
• Iterate get_files_found() + endswith + empty-guard (no blind [0]).
• addTime → timezone-aware UTC datetime; get_relative_path on source.

duetLocations.py

• v1 → v2; context form. Manual SEGB binary stream parsing preserved (struct/BytesIO).
• Location timestamps via webkit_timestampsconv (UTC); Latitude/Longitude routed to the framework KML via output_types: 'all' (drops the manual kmlgen call).
• get_relative_path on each source; consolidates records across all matched stream files.
• Removed dead utf8_in_extended_ascii helper and unused imports (blackboxprotobuf, mktime, StringIO, ArtifactHtmlReport, tsv, timeline, kmlgen).

Validation

• pylint 10.00/10 (CI --disable=C,R); compile/ast OK.
• Mandatory reserved-word CREATE TABLE audit: PASS (key, value, timestamp, latitude, longitude, horizontal_accuracy, altitude, speed — none reserved).
• Isolated import OK, __wrapped__ present; no cross-module imports of the old names (dead local utf8_in_extended_ascii was not imported elsewhere; googleChat uses the ilapfuncs version).