Fix lnino/array_remove

[sfc-gh-lninobrijaldo]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SIT-1755

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.

3. Please describe how your code solves the related issue.

   Cast the element parameter to VARIANT if it is a string to ensure correct handling by the array_remove function. This prevents type mismatch issues that could occur when the input is not already of the VARIANT type.

[sfc-gh-aalam]

other changes look good. some of the changes are already covered in doctest so adding so many tests cases is not necessary but it doesn't hurt too much either :)

[sfc-gh-aalam]

not: creating a dataframe here (and other updates below) is not necessary