[Transform] add hlrc integration tests for get and getStats

[hendrikmuhs]

add hlrc integration tests for get and getStats

closes #43052

(fixes the oldest transform issue ;-) )

[dimitris-athanasiou]

Code looks good. I think the PR description shouldn't state that it fixes #43052 as this commit only adds tests that guard the fix.

I also have a small concern whether the test is slow. How long does it take? If it's too long, perhaps we can put fewer transforms while still having more than 100.

[hendrikmuhs]

Code looks good. I think the PR description shouldn't state that it fixes #43052 as this commit only adds tests that guard the fix.

will change it to closes, the fix is #62809, but did not wanted to close the issue without verification.

I also have a small concern whether the test is slow. How long does it take? If it's too long, perhaps we can put fewer transforms while still having more than 100.

I tested it, it seemed ok, arguable it will take longer on CI than on my dev machine. It runs in parallel to other tests and seems not to make the build taking longer.

[dimitris-athanasiou]

LGTM