[Enhancement] replace assertTrue(X.equals(X)) with assertEquals

[ROTBOR]

Proposed changes

Issue Number: close #11916

Problem summary

replace assertTrue(X.equals(X)) with assertEquals.

Checklist(Required)

1. Does it affect the original behavior:
   • Yes
   • No
   • I don't know
2. Has unit tests been added:
   • Yes
   • No
   • No Need
3. Has document been added or modified:
   • Yes
   • No
   • No Need
4. Does it need to update dependencies:
   • Yes
   • No
5. Are there any changes that cannot be rolled back:
   • Yes (If Yes, please explain WHY)
   • No

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[jackwener]

I suggest the you can use intellij IDEA open project. And IDEA will suggest it and auto fix it.

[jackwener]

ut failed, you can click FE and click login as a guest.
you can see which fe fail.

I don't recommend that you correct this PR by manually changing, Use IDEA auto fix, which will not cause error.