Correction to storage profiler write sample data size #5191

[kev365]

Fixes #5191.

_WriteNewAttributeContainer rebound serialized_data to the compressed blob before
sampling it, so the storage profiler's write_new samples carried the compressed
length in both the Data size and the Compressed data size column. The value bound
for the _data column is now a separate name, leaving serialized_data holding the
serialized container when the sample is taken.

	Data size	Compressed data size
before	107	107
after	1266	107

compressed_data in the non-compressed branch is also b"" now, matching
_CreateAttributeContainerFromRow.

Storage file contents are unchanged — the compressed blob is still what is written to
the _data column, and the read path was already correct.

tests/storage/sqlite/sqlite_file.py had no case that attached a storage profiler.
testWriteNewAttributeContainerWithStorageProfiler writes an event_data container
through a real StorageProfiler, reads back the storage-*.csv.gz sample file, and
asserts the data size exceeds the compressed data size. It fails on the parent commit
with AssertionError: 89 not greater than 89.

Verified: 57 tests in tests/storage, 44 in the storage and profiler modules, and the
30 CLI tool tests in tests/cli/{psteal,psort,log2timeline}_tool.py. pylint and
black clean on both files. The one CLI failure,
log2timeline_tool.testExtractEventsFromSourcesOnBDEImage, reproduces identically on
the unmodified parent commit and passes when run on its own — a local environment
issue, not related to this change.

Backward compatibility

None affected. The change is confined to which value the profiler samples; the stored
data, the storage format, and the profiler's CSV schema are all unchanged.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.10%. Comparing base (6fadae7) to head (5293516).

Files with missing lines	Patch %	Lines
plaso/storage/sqlite/sqlite_file.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5192   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files         456      456           
  Lines       41089    41090    +1     
=======================================
+ Hits        34967    34970    +3     
+ Misses       6122     6120    -2     

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[joachimmetz]

LGTM