Fixes #29491 - Simplify Plugin#pending_migration method

Fixes #29477 - updated VMware vSphere 7.0 VM Hardware version

Fixes #29474 - remove :on from save callbacks

This was silently ignored, and will fail in rails 6. Changing the
callbacks to the correct ones intended according to the :on option.

Fixes #29464 - plain inputs can be hidden

Some inputs can be sensitive. Users typing such values would prefer to
have the value hidden in the form. The sensitive information can be a
password, private key or general multiline text. Therefore we aren't
limitting the input to type=password, but use text area with hiding...

Fixes #29178 - improved labels and help on proxy page

Fixes #1513 - distinguish between RHEL 7 Server and Workstation

When facts are received we parse them and create/assign the operating
system of a host accordingly. We didn't correctly detect the right RHEL
7 distribution and considered every RHEL 7 as Server. For people having...

fixes #29432 - add flatcar os support

Fixes #28734 - Add hostgroup inherited parameters in GET

Fixes #29386 - fix setting_type for oidc_audience

Refs #20832 - extract strings