Remove unused shell version ClickHouse data migration code

[yanjunz97]

We replace the shell version ClickHouse data migration by the Golang version in Theia v0.3.

The unused bash code and migrators for the bash version ClickHouse data migration
are removed in this PR.

Signed-off-by: Yanjun Zhou [email protected]

[codecov-commenter]

Codecov Report

Merging #155 (fcbd0b6) into main (b1ce1cd) will increase coverage by 9.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   41.04%   50.30%   +9.26%     
==========================================
  Files          81       54      -27     
  Lines        5806     3886    -1920     
==========================================
- Hits         2383     1955     -428     
+ Misses       3200     1739    -1461     
+ Partials      223      192      -31     

Flag	Coverage Δ
unit-tests	50.30% <ø> (+9.26%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
snowflake/cmd/receiveSqsMessage.go
...wflake/pkg/aws/client/s3/testing/mock_interface.go
snowflake/cmd/policyRecommendation.go
snowflake/pkg/aws/client/s3/client.go
snowflake/pkg/infra/backends.go
snowflake/pkg/snowflake/snowflake.go
snowflake/pkg/aws/client/s3/region.go
snowflake/pkg/infra/manager.go
snowflake/cmd/createKmsKey.go
snowflake/pkg/aws/client/kms/client.go
... and 17 more

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