Remove dangling csv and ipc tests in arrow/Cargo.toml

[alamb]

Which issue does this PR close?

re #3045

Rationale for this change

When trying to release arrow 27.0.0 using (cd arrow && cargo release) I got the following errors until I removed these entries:

error: failed to verify package tarball

Caused by:
  failed to parse manifest at `/Users/alamb/Downloads/apache-arrow-rs-27.0.0/arrow/target/package/arrow-27.0.0/Cargo.toml`

Caused by:
can't find `ipc` test at `tests/ipc.rs` or `tests/ipc/main.rs`. Please specify test.path if you want to use a non-default path.



error: failed to verify package tarball

Caused by:
  failed to parse manifest at `/Users/alamb/Downloads/apache-arrow-rs-27.0.0/arrow/target/package/arrow-27.0.0/Cargo.toml`

Caused by:
can't find `csv` test at `tests/csv.rs` or `tests/csv/main.rs`. Please specify test.path if you want to use a non-default path.

What changes are included in this PR?

Delete offending entries in Cargo.toml

I am not at all sure deleting them is correct but it is what I needed to do to get the package released on crates.io

Are there any user-facing changes?

[tustvold]

I wonder if the issue is the include directive excludes the integration tests?

[alamb]

I plan to look at this one later (before the next release) but don't have the time to devote to tracking it down now

[alamb]

Marking as a draft until I have this sorted out

[alamb]

Drat -- I didn't sort this out in time for the release -- I'll do it while waiting for some of this release to go out

[alamb]

New proposal #3196

(basically I did what @tustvold suggested)