Fix: Modified error message for invalid pwd and username

[PushparajShetty]

Description of your changes

Fixes #917

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.30%. Comparing base (2ab672c) to head (71f00bf).
Report is 6 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (2ab672c) and HEAD (71f00bf). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (2ab672c)	HEAD (71f00bf)
apiserver-unittests	1	0
server-e2e-tests	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #918       +/-   ##
===========================================
- Coverage   59.01%   48.30%   -10.72%     
===========================================
  Files         116      116               
  Lines       19846    19852        +6     
===========================================
- Hits        11713     9590     -2123     
- Misses       6696     9021     +2325     
+ Partials     1437     1241      -196     

Flag	Coverage Δ
apiserver-unittests	?
server-e2e-tests	48.30% <ø> (-0.01%)	⬇️

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