Table Text Alignment Settings Reset When Modifying Individual Cells

[Louis_Dubruel]

Issue Description: After the recent Looker Studio update, there's a critical bug affecting table formatting. When setting text alignment for an individual cell, it automatically resets the previously configured alignment settings for other columns in the same table.

Steps to Reproduce:

1. Create a table with multiple columns
2. Configure text alignment for different columns (e.g., center, left, right)
3. Modify text alignment for a single cell in any column
4. Observe that previously set column alignments are reset/overridden

Expected Behavior: Individual cell formatting should not affect column-level alignment settings that were previously configured.

Actual Behavior: Setting alignment for one cell resets the alignment configuration for other columns, requiring users to reconfigure all table formatting.