Destination redshift: Remove encrypted staging option

[edgao]

discovered in https://github.com/airbytehq/oncall/issues/5422

this option has never worked. It was added in #14013, which copied the Snowflake SQL syntax from #12452. Redshift's SQL incantation is slightly different; attempting to use this option results in a syntax error.

Let's just remove the option for now (it has never worked, and nobody is currently using it). I submitted https://github.com/airbytehq/airbyte-internal-issues/issues/8164 to fix it, but... nobody is exactly clamoring for this feature, so 🤷

(I reserve the right to delete the relevant code in a later PR in this stack, but leaving it as-is for now)

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[edgao]

• Destination redshift: Use new interfaces #39008 : 2 dependent PRs (#39334 , #40201 )
• Destination redshift: Remove encrypted staging option #39141 👈
• Destination redshift: convert test classes to kotlin #38893
• Destination redshift: remove standard inserts #38886
• master

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