Missing class variable $configManager in controller "ConfigTrackController"

Problem/Motivation

While going through the codebase, found that the class ConfigTrackController has an undeclared property variable "configManager", which is initialised in the constructor on line 61 and used in line 243. The need to address this issue is because PHP 8.2 will show a deprecated warning for dynamic properties and PHP 9.0 a fatal error.

More info on this https://php.watch/versions/8.2/dynamic-properties-deprecated

Steps to reproduce

Check the file "config_track/src/Controller/ConfigTrackController.php"

Proposed resolution

Declare the variable in the class

Remaining tasks

Create a patch and test

User interface changes

N/A

API changes

N/A

Data model changes

N/A