fix: clean shadow tables

[asthamohta]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.34%. Comparing base (810e553) to head (5730cd5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2207      +/-   ##
============================================
+ Coverage     47.06%   55.34%   +8.27%     
+ Complexity     4048     1641    -2407     
============================================
  Files           876      409     -467     
  Lines         52223    22213   -30010     
  Branches       5505     2205    -3300     
============================================
- Hits          24577    12293   -12284     
+ Misses        25885     9203   -16682     
+ Partials       1761      717    -1044     

Components	Coverage Δ
spanner-templates	70.41% <ø> (+1.50%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	76.48% <ø> (ø)
spanner-live-reverse-replication	78.80% <ø> (ø)
spanner-bulk-migration	87.94% <ø> (ø)

see 485 files with indirect coverage changes