Remove sqllogictest fork swap from regenerate_sqlite_files.sh

[RafaelHerrero]

Which issue does this PR close?

Related to #6543 and #21260

Rationale for this change

The regenerate_sqlite_files.sh script swaps in a forked version of sqllogictest-rs (Omega359/sqllogictest-rs v0.27.2) before running test completion. This fork added valuewise result mode, valuesort, and custom normalizer support.

These features were upstreamed to risinglightdb/sqllogictest-rs in v0.24.0 (PR #237). DataFusion already uses upstream v0.29.1 which includes everything, so the fork swap is no longer needed.

What changes are included in this PR?

• Remove the Cargo.toml dependency swap to the Omega359 fork (line 167)
• Remove the bin/sqllogictests.rs file swap with the custom regenerate version (line 172)
• Remove the cleanup steps that reverted those swaps (lines 203-204)
• Update the script description to reflect the simplified flow

Are these changes tested?

The script has valid bash syntax. The change is purely removing dead code — the fork features are already available in the upstream version DataFusion uses.

Are there any user-facing changes?

No.

[alamb]

Thank you for this @RafaelHerrero . I tested running this script locally like

PG_URI=postgresql://postgres@localhost:5432/postgres nice ./datafusion/sqllogictest/regenerate_sqlite_files.sh

And it made a bunch of errors like this:

External error: task 948 panicked with message "called `Result::unwrap()` on an `Err` value: ParseError { kind: InvalidLine(\"onlyif mysql # use DIV operator for integer division\"), loc: Location { file: \"../../datafusion-testing/data/sqlite/random/select/slt_good_99.slt\", line: 60, upper: None } }"
Error: Execution("428 failures")
error: test failed, to rerun pass `-p datafusion-sqllogictest --test sqllogictests`

Caused by:
  process didn't exit successfully: `/Users/andrewlamb/Software/datafusion2/target/release-nonlto/deps/sqllogictests-a999e2d90c5771c0 --include-sqlite --postgres-runner --complete` (exit status: 1)
Completion of sqlite test files failed!
Cleaning up source code changes and temporary files and directories

Do you have any idea what is going on?

maybe @Omega359 has some ideas as he was the original author of this script

[Omega359]

I thought I replied to this already but apparently hitting the 'comment' button was too much for me the other day :/

I think the fork does more than what was upstreamed though I'd have to diff the code at this point to know what exactly I changed. Ideally, yes I'd like to not have a fork for this but I haven't had the time nor desire to see what that would involve.