[DOCS] Remove support for EOL OSs and `SysV init` (#78199)
[DOCS] Remove support for EOL OSs and `SysV init` (#78199)

Adds an 8.0 breaking change for the removal of support for several EOL operating
systems and `SysV init`.

Relates to #51480 and #51716
GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch