Fix SnowflakeOperatorAsync XCom value to return

[bharanidharan14]

Return an XCom of results in SnowflakeOperatorAsync as same as the sync version SnowflakeOperator

closes: #714

[codecov]

Codecov Report

Base: 98.47% // Head: 98.48% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5fc62f1) compared to base (dfea8e0).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 5fc62f1 differs from pull request most recent head 3cd854f. Consider uploading reports for the commit 3cd854f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #781   +/-   ##
=======================================
  Coverage   98.47%   98.48%           
=======================================
  Files          86       86           
  Lines        4663     4682   +19     
=======================================
+ Hits         4592     4611   +19     
  Misses         71       71           

Impacted Files	Coverage Δ
astronomer/providers/snowflake/hooks/snowflake.py	98.73% <100.00%> (+0.32%)	⬆️
...ronomer/providers/snowflake/operators/snowflake.py	100.00% <100.00%> (ø)

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[bharanidharan14]

Closed PR #752 created separate PR to return an XCom of results in SnowflakeOperatorAsync as same as the sync version SnowflakeOperator.

[bharanidharan14]

@rajaths010494 @pankajkoti @phanikumv can you review this PR

[pankajkoti]

Looks good to me but have a question inline. Can we not remove that line to 'return None' ?