Aliyun: Switch iceberg-aliyun's tests to Junit5

[lisirrx]

Switch iceberg-aliyun's tests to Junit5
Fix: #9081
@nastra Hi, I have changed all of the junit4 code to junit5 with AssertJ, but I have a question here: To fit the Extension class of Junit5, I changed most of the term 'Rule' to 'Extension', but there is a system env variable in org/apache/iceberg/aliyun/TestUtility.java called ALIYUN_TEST_OSS_TEST_RULE_CLASS.
I don't know where the CI system runs, and how the variable is set. So I'm not sure if I should change this.

[nastra]

@lisirrx thanks for working on this. I left a few inital comments and I'll take a closer look tomorrow at the issue around TestUtility

[nastra]

just a few small things to fix, but overall this LGTM.

I also checked how the env variables are being used and they are not set by our CI. They were introduced by #3687, so pinging @openinx to also have a look at the proposed changes here.

[lisirrx]

just a few small things to fix, but overall this LGTM.

I also checked how the env variables are being used and they are not set by our CI. They were introduced by #3687, so pinging @openinx to also have a look at the proposed changes here.

Thank you for your patient review. I'm sorry for introducing unnecessary blank lines. I will pay attention to this issue when writing code in the future.
If I understand correctly, will the integration test of this package only run locally on the developer's computer? I ran these tests successfully with my own Aliyun AK/SK. Maybe let's wait for @openinx ‘s opinion.

Btw, should I squash the commits together or you will do that when merging the pr?

[nastra]

Btw, should I squash the commits together or you will do that when merging the pr?

commits will be squashed when the PR is getting merged, so it's up to you if you want to squash them or not.

[lisirrx]

Btw, should I squash the commits together or you will do that when merging the pr?

commits will be squashed when the PR is getting merged, so it's up to you if you want to squash them or not.

hi, @nastra, any addtional work should I do for this PR to move forward?

[nastra]

Btw, should I squash the commits together or you will do that when merging the pr?

commits will be squashed when the PR is getting merged, so it's up to you if you want to squash them or not.

hi, @nastra, any addtional work should I do for this PR to move forward?

Let's give @openinx a few days to review this PR