security web: add esm-infra-legacy pockets WD-17330 WD-19534

[rodrigoffzz]

Done

• we need the "Available with Ubuntu Pro" tag for the pocket "esm-infra-legacy" as we have for "esm-infra";
• esm-infra-legacy pocket already exists in https://github.com/canonical/ubuntu-com-security-api and is being pushed by the security team for a while;
• without this tag there is no indication that an update is placed in a different place and could be mislead our users
• for now, I don't see a need to add this pocket in other places like Entitlements and in the list of products in the ubuntu advantage category, this feels like a commercial discussion which I don't want to drive here in this PR

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• Check for CVEs and USNs where the pocket "esm-infra-legacy" is present, such as:
  • https://ubuntu.com/security/CVE-2021-4156
  • https://ubuntu.com/security/notices/USN-7273-1

Issue / Card

Fixes https://warthogs.atlassian.net/browse/WD-17330
Fixes https://warthogs.atlassian.net/browse/WD-19534

Screenshots

A test for the CVE webpage with the text added (the text has changed, but the idea remains)

Help

QA steps - Commit guidelines

[webteam-app]

rodrigoffzz is not a collaborator of the repo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.93%. Comparing base (4bf8f5c) to head (5ced7fa).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14806      +/-   ##
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- Coverage   71.95%   71.93%   -0.03%     
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  Files         120      120              
  Lines        3430     3431       +1     
  Branches     1179     1179              
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  Hits         2468     2468              
- Misses        932      933       +1     
  Partials       30       30