Substitute env username and password variables for nexus by using instead Jenkins variable "cd-user-with-password"

[jeronimolina]

• Modified all calls to NexusService by inserting the Jenkins secret "cd-user-with-password" instead of retrieving the NEXUS_USERNAME and NEXUS_PASSWORD env variables. On vars\odsComponentStageScanWithSonar.groovy, vars\odsComponentStageScanWithAqua.groovy, vars\odsComponentStageScanWithTrivy.groovy and src\org\ods\component\Pipeline.groovy
• NexusService class: removed the retrieving of the env variables in the function readConfigFromEnv
• NexusService class: added jenkins credentials in function newFromEnv

[jafarre-bi]

@jeronimolina we can have a call to comment on this.

[jeronimolina]

Hello @jafarre-bi I added encryption on the NexusService class, now we are not storing directly the plain password into the class. If you can take a look and give me your opinion!