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]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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[qweeah]

LGTM