Bug 1933162

Verified with Sat 6.9.0 snap 12.

It's now possible to use `erratum.title` in the report template, which contains synopsis of the erratum, e.g. "Important: freetype security update", and 'erratum.summary' which contains errata summary text. Example based on Applicable Errata report template:

```
<%#
name: Host - Applicable Errata
snippet: false
template_inputs:
- name: Hosts filter
  required: false
  input_type: user
  description: Limit the report only on hosts found by this search query. Keep empty
    for report on all available hosts.
  advanced: false
  value_type: search
  resource_type: Host
- name: Errata filter
  required: false
  input_type: user
  description: Limit the report only on errata found by this search query. Keep empty
    for report on all available errata.
  advanced: false
model: ReportTemplate
require:
- plugin: katello
 version: 3.16.0
-%>
<%- report_headers 'Host', 'Operating System', 'Environment', 'Erratum', 'Type', 'Published', 'Applicable since', 'Severity', 'Packages', 'CVEs', 'Reboot suggested', 'Synopsis', 'Summary'-%>
<%- load_hosts(search: input('Hosts filter'), preload: [:operatingsystem, :lifecycle_environment]).each_record do |host| -%>
<%-   host_applicable_errata_filtered(host, input('Errata filter')).each do |erratum| -%>
<%-     report_row(
          'Host': host.name,
          'Operating System': host.operatingsystem,
          'Environment': host.lifecycle_environment,
          'Erratum': erratum.errata_id,
          'Type': erratum.errata_type,
          'Published': erratum.issued,
          'Applicable since': erratum.created_at,
          'Severity': erratum.severity,
          'Packages': erratum.package_names,
          'CVEs': erratum.cves.map { |c| c.cve_id },
          'Reboot suggested': erratum.reboot_suggested,
          'Synopsis': erratum.title,
          'Summary': erratum.summary
        ) -%>
<%-   end -%>
<%- end -%>
<%= report_render -%>
```

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Satellite 6.8.5 Async Bug Fix Update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1057