Login with different User as defined in Plattform

### Is your feature request related to a problem? Please describe.

Given we have a user defined in Jenkins

System / JFrog Plugin Configuration / JFrog Platform details / Credentials

user: org-entw-user
Passwd: xxx

so every pipeline is bound to one user only

we work with projects and each project in artifactory has a project-user
i need a way to configure jf command inside the pileline

### Describe the solution you'd like to see

I my jenkinsfile i want to configure the jf instance to use a different user for publish
-- user=my-project-user
-- password=somePW

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Start with the Jenkinsfile request and the JFrog Plugin Configuration path described in the issue, then trace how credentials reach the jf command. The issue names no source files or tests, so the relevant pipeline entry point must first be located. Done means a pipeline can publish using a project-specific user without changing the configured Jenkins credentials.

Written by the indexing model from the issue text.