GH-33777: [R] Nightly builds failing due to dataset test not being skipped on builds without datasets module

[thisisnic]

The minimal builds were failing due to a new test which requires the datasets module; I've just skipped this test on builds where this module isn't installed.

• Closes: [R] Nightly builds failing due to dataset test not being skipped on builds without datasets module #33777

[github-actions]

• Closes: [R] Nightly builds failing due to dataset test not being skipped on builds without datasets module #33777

[thisisnic]

@github-actions crossbow submit test-r-minimal-build

[github-actions]

Revision: de1d764

Submitted crossbow builds: ursacomputing/crossbow @ actions-8bd0b2f0ff

Task	Status
test-r-minimal-build

[paleolimbot]

@github-actions crossbow submit test-r-offline-minimal

[github-actions]

Revision: de1d764

Submitted crossbow builds: ursacomputing/crossbow @ actions-ae4cf10f4d

Task	Status
test-r-offline-minimal

[paleolimbot]

Thank you!

[ursabot]

Benchmark runs are scheduled for baseline = fc1f9eb and contender = a1a587b. a1a587b is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Finished ⬇️0.0% ⬆️0.0%] ec2-t3-xlarge-us-east-2
[Finished ⬇️0.87% ⬆️0.0%] test-mac-arm
[Failed] ursa-i9-9960x
[Failed] ursa-thinkcentre-m75q
Buildkite builds:
[Finished] a1a587b1 ec2-t3-xlarge-us-east-2
[Finished] a1a587b1 test-mac-arm
[Failed] a1a587b1 ursa-i9-9960x
[Failed] a1a587b1 ursa-thinkcentre-m75q
[Finished] fc1f9ebb ec2-t3-xlarge-us-east-2
[Finished] fc1f9ebb test-mac-arm
[Failed] fc1f9ebb ursa-i9-9960x
[Failed] fc1f9ebb ursa-thinkcentre-m75q
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

[ursabot]

['Python', 'R'] benchmarks have high level of regressions.
test-mac-arm