[BUGFIX] Changelog install tool: Duplicate ids prevent expand

Expand / collapse sections need a unique id to be properly
collapsible. The "Changelog documentation viewer" uses the
forge issue number for this, which is not unique.
The patch changes the id to use a prefix per version / section
and the loop interation index.

Change-Id: I350d404c61b989deab34bf517e2890e567cb3172
Resolves: #83376
Release: master, 8.7
Reviewed-on: https://review.typo3.org/55148


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>