fix(resnames): Fix resname builder name conflicts in Builder ctor

[miraleung]

Fixes the following name conflict, which can occur in resource name helper classes. The relevant field in the example below is settingName.

 /** Builder for projects/{project_number}/settings/{setting_name}. */                              
public static class Builder {                                                                      
    private String projectNumber;                                                                    
    private String settingName; 

    // Existing code here.                                                                 
                                                                                                                                                                                                                                          
    private Builder(SettingName settingName) {                                                       
      Preconditions.checkArgument(                                                                   
          Objects.equals(settingName.pathTemplate, PROJECT_NUMBER_SETTING_NAME),                     
          "toBuilder is only supported when SettingName has the pattern of projects/{project_number}/settings/{setting_name}");
      projectNumber = settingName.projectNumber;                                                
      settingName = settingName.settingName;                                                    
    }                                                                                             
}    

[codecov]

Codecov Report

Merging #769 (c61aeae) into master (4f187b1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #769   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files         140      140           
  Lines       14794    14795    +1     
  Branches     1052     1052           
=======================================
+ Hits        13568    13569    +1     
  Misses        942      942           
  Partials      284      284           

Impacted Files	Coverage Δ
.../resourcename/ResourceNameHelperClassComposer.java	91.99% <100.00%> (+<0.01%)	⬆️

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[vam-google]

LGTM