find better way to release 2.0

[vdelendik]

most of our management jobs uses master branch. Due to the breaking change in jenkins jobdsl (#273) we seems like can't merge to master latest changes. But better to test using such scenario:

1. setup CE using master branch (v2.2)
2. update all Management_Jobs pipelines replacing master to develop:

@Library('Zebrunner-CE@master')
->
@Library('Zebrunner-CE@develop')

3. test that such updated jobs work correctly:
   RegisterOrganization
   RegisterReportingCredentials
   RegisterHubCredentials
   RegisterMavenSettings
   DeleteOrganization

if all good with these jobs and management jobs can generate content using previous pipeline-ce v1.8 we can merge to master and branch to 2.0

[vdelendik]

all good we can merge to master but in general it has sense:

1. keep master as is.
2. Make main as default one
3. merge develop to main
4. update all management jobs in jenkins to use main starting from the next release.

it should guarantee 100% compatibility for the existing CE environments