The display unit for memory and JVM is incorrect; it should be GB but is showing B.

After I upgrade graylog cluster from 7.0 to 7.1.3, the display unit for memory and JVM is incorrect; it should be GB but is showing B, like the pic below:

## Expected Behavior
like the pic, my jvm is 8 GB, and memory is 16GB(15.4GB), but display is 8B and 15.4b

## Possible Solution
Change B to GB

## Steps to Reproduce (for bugs)

1. open graylog webui
2. in system/cluster configuration
3. in cluster configuration

## Your Environment

* Graylog Version: 7.1.3
* Operating System: Rocky Linux 9

## Checklist
[] This issue fix need to be backported.
[] Does this issue have **security** implications?