feat: improve error message when detecting conflicting flags

[wangxiaoxuan273]

What this PR does / why we need it: Improve error message when detecting conflicting flags. Current display:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #1340

Please check the following list:

• [ ] Does the affected code have corresponding tests, e.g. unit test, E2E test?
• [ ] Does this change require a documentation update?
• [ ] Does this introduce breaking changes that would require an announcement or bumping the major version?
• [ ] Do all new files have an appropriate license header?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.56%. Comparing base (fa65f61) to head (30bdbbc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1345 +/- ## ========================================== + Coverage 84.51% 84.56% +0.05% ========================================== Files 103 103 Lines 3655 3668 +13 ========================================== + Hits 3089 3102 +13 Misses 337 337 Partials 229 229 ```

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