chore: improve validateClusterStatName

[zirain]

Improve validateClusterStatName function, %ROUTE_NAME is invalid.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.31%. Comparing base (84cd21c) to head (6cb7da3).

Files with missing lines	Patch %	Lines
api/v1alpha1/validation/envoyproxy_validate.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7440      +/-   ##
==========================================
+ Coverage   72.29%   72.31%   +0.02%     
==========================================
  Files         232      232              
  Lines       34114    34104      -10     
==========================================
+ Hits        24662    24664       +2     
+ Misses       7676     7669       -7     
+ Partials     1776     1771       -5     

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[arkodg]

LGTM thanks

[sudiptob2]

Should this be invalid ? %ROUTE_NAME%/%. Currently, this is treated as valid.

[zirain]

Should this be invalid ? %ROUTE_NAME%/%. Currently, this is treated as valid.

what is this used for?

[sudiptob2]

Should this be invalid ? %ROUTE_NAME%/%. Currently, this is treated as valid.

what is this used for?

I see, not used just tried with this random string. I guess it's not needed.