[SPARK-37086][R][ML][TESTS] Fix the R test of FPGrowthModel for Scala 2.13

[sarutak]

What changes were proposed in this pull request?

This PR fixes an issue that the R test of FPGrowthModel fails with Scala 2.13.
Similar to the issue filed in SPARK-37059 (#34330), the R test of FPGrowthModel assumes that the result records returned by FPGrowthModel.freqItemsets are sorted by a certain kind of order but it's wrong.
As a result, the test fails with Scala 2.13.

 ══ Failed ══════════════════════════════════════════════════════════════════════
── 1. Failure (test_mllib_fpm.R:42:3): spark.fpGrowth ──────────────────────────
`expected_itemsets` not equivalent to `itemsets`.
Component “items”: Component 1: Component 1: 1 string mismatch
Component “items”: Component 2: Length mismatch: comparison on first 1 components
Component “items”: Component 2: Component 1: 1 string mismatch
Component “items”: Component 3: Length mismatch: comparison on first 1 components
Component “items”: Component 4: Length mismatch: comparison on first 1 components
Component “items”: Component 4: Component 1: 1 string mismatch
Component “items”: Component 5: Length mismatch: comparison on first 1 components
Component “items”: Component 5: Component 1: 1 string mismatch
Component “freq”: Mean relative difference: 0.5454545

Why are the changes needed?

For test stability.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

All the R tests passed on GA with a modified GA config to run with Scala 2.13 (set scala2.13 to the SPARK_PROFILE environment variable).
https://github.com/sarutak/spark/runs/3964081433?check_suite_focus=true#step:7:380

Test for Scala 2.12 should be done on the regular GA.

[SparkQA]

Test build #144509 has finished for PR 34357 at commit 0a8d5e1.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48981/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48981/

[dongjoon-hyun]

Could you check AppVeyor failure?

[sarutak]

Hmm, recently, AppVeyor seems to fail almost every time.
https://ci.appveyor.com/project/ApacheSoftwareFoundation/spark/history

But I'll re-trigger it.

[SparkQA]

Test build #144512 has finished for PR 34357 at commit 2a061de.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48984/

[SparkQA]

Test build #144513 has finished for PR 34357 at commit b070ec8.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48984/

[SparkQA]

Test build #144514 has finished for PR 34357 at commit 7bde2a6.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48985/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/48985/

[HyukjinKwon]

AppVeyor is very flaky .. I tried so hard to fix but no luck 😢

[HyukjinKwon]

LGTM

[HyukjinKwon]

Merged to master.