[WIP] Add missing info about unavailable fields while adding/editing Report

[hstastna]

Partially fixes:
https://bugzilla.redhat.com/show_bug.cgi?id=1581817

Depends on:
ManageIQ/manageiq#17501

---

What:
When choosing Chargeback for Images/Projects/Vms under Configure Report Columns section while adding a new/editing an existing Report under Cloud Intel > Reports > Reports, some of the fields are not available. This is ok but there was a misunderstanding that those fields were missing there. This is why I add note/info about which fields are not supported to the Report editing screen (in this PR), and also new selector for Chargeback Rate editing screen (under Cloud Intel > Chargeback > Rates) is added to choose what the Rate is based on (Images/Projects/Vms) (other PR: #4001). We call it the base model (see ManageIQ/manageiq-schema#209).

---

Before:
Choosing Chargeback for Images while adding/editing report:

Choosing Chargeback for Projects:

Choosing Chargeback for Vms:

After:
Choosing Chargeback for Images while adding/editing report:

Choosing Chargeback for Projects:

Choosing Chargeback for Vms:

[hstastna]

@miq-bot add_label bug

[hstastna]

@martinpovolny @mzazrivec Could you please look at this PR? Thanks! :)

[miq-bot]

Checked commit hstastna@9ac93a9 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 1 offense detected

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• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby23, which recognizes
warning: 2.3.6-compliant syntax, but you are running 2.3.3.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

[miq-bot]

This pull request has been automatically closed because it has not been updated for at least 6 months.

Feel free to reopen this pull request if these changes are still valid.

Thank you for all your contributions!