Properly deactivate packages list from major release pages

[NotTheEvilOne]

What this PR does / why we need it:
This PR superseeds #318 and deactivates the packages list for major release pages. Reason is a size limitation by GitHub not checked and handled in the release page generation.

 {
   "message": "Validation Failed",
   "errors": [
     {
       "resource": "Release",
       "code": "custom",
       "field": "body",
       "message": "body is too long (maximum is 125000 characters)"
     }
   ],
   "documentation_url": "https://docs.github.com/rest/releases/releases#create-a-release",
   "status": "422"
 }

Which issue(s) this PR fixes:
Related #189
Related gardenlinux/gardenlinux#3777

Special notes for your reviewer:
This is a temporary solution until a proper one is found.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.58%. Comparing base (a776256) to head (156bc0c).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #319      +/-   ##
==========================================
+ Coverage   91.51%   91.58%   +0.06%     
==========================================
  Files          42       42              
  Lines        2158     2151       -7     
==========================================
- Hits         1975     1970       -5     
+ Misses        183      181       -2     

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