chore: Modify the error message of UniqueKeyError

[He1pa]

1. Does this PR affect any open issues?(Y/N) and add issue references (e.g. "fix #123", "re #123".):

• N
• Y
  

[Peefy]

Grammar CI failed.

[coveralls]

Pull Request Test Coverage Report for Build 10385644136

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 70.587%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
kclvm/sema/src/resolver/global.rs	0	1	0.0%

Totals
Change from base Build 10384573391:	0.0%
Covered Lines:	50595
Relevant Lines:	71678

---

💛 - Coveralls