remove v1 tokens gateway APIs

[bcmdarroch]

• delete token proto
• drop TokensV2Client
• replace v1 API paths with v2

./src/app/components/settings-sidebar/settings-sidebar.component.html:28:    
<app-authorized  #tokens [anyOf]="[['/auth/tokens', 'get'], ['/iam/v2/tokens', 'get']]">

./src/app/modules/token/token-list/api-token-list.component.html:32:        
<app-authorized [anyOf]="[['/iam/v2/tokens', 'post'], ['/auth/tokens', 'post']]">

./src/app/modules/token/token-list/api-token-list.component.html:41:      
<app-authorized [anyOf]="[['/iam/v2/tokens', 'get'], ['/auth/tokens', 'get']]">

• fix/port affected tests