Revert [SPARK-50230][SQL] Added logic to support reading unknown collation name as utf8_binary

[vladanvasi-db]

What changes were proposed in this pull request?

I propose reverting changes for new SQLConf entry which enables spark to read an invalid collation name as UTF8_BINARY.

Why are the changes needed?

Since the original changes may bring unwanted data corruption when a user writes in a table that has unknown collation and modifies its properties, the original PR must be reverted.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Not applicable.

Was this patch authored or co-authored using generative AI tooling?

No.

[vladanvasi-db]

@MaxGekk please take a look at this one.

[MaxGekk]

changes may bring unwanted data corruption

@vladanvasi-db Could you explain in PR's description how this could happen.

[MaxGekk]

@vladanvasi-db Could you fix tests, please:

[info] - group-by-all-mosha.sql *** FAILED *** (838 milliseconds)
[info]   group-by-all-mosha.sql
[info]   Expected "...   "expression" : "'[42.0]'",
[info]       "sourceType"...", but got "...   "expression" : "'[13.37]'",
[info]       "sourceType"..." Result did not match for query #4
[info]   SELECT i + 1, f / i, substring(s, 2, 3), extract(year from t), d / 2, size(a) FROM stuff
[info]   GROUP BY ALL ORDER BY 1, 3, 4, 5, 6, 2 (SQLQueryTestSuite.scala:663)