do not fetch metrics data right after connecting live data to an app

[martinlippert]

As mentioned in #1002 (comment), at the moment the live hover mechanics fetch the live data for certain metrics right after creating a connection to the running application - whether the metrics data is used or not.

We should change this behavior in a way that metrics data is only fetched when it is needed.

Side note: we need to double check the memory visualization in the VSCode Spring Dashboard implementation that heavily relies on the metrics data when changing this behavior.

[vudayani]

@BoykoAlex
As you mentioned in #1002 (comment), we can remove the refresh metrics calls from here.

On the vscode-spring-boot-dashboard extension, we can execute the "sts/livedata/refresh/metrics" command to query for the memory metrics before trying to fetch and display it in the memory view. (microsoft/vscode-spring-boot-dashboard@868e02e)

[BoykoAlex]

Thank you @vudayani-vmw !
I have removed the metrics refresh from the location referenced above: ddacce5ca0d96fc8002c543965c11ec4f503d486