[wpe][cross-toolchain-helper][browserperfdash] Add netdata into the cross-toolchain-helper images for the RPi boards and send local timestamps on browserperfdash

• Component: WPE WebKit
• Status: RESOLVED FIXED

[Carlos Alberto Lopez Perez]

We are experimenting with a new concept for showing performance data from the bots that relies on netdata to profile the whole system metrics.

So we want to:

 - add netdata into the images for the RPi boards (this is generally useful as it can be used to check performance metrics of the boards)
 - send timestamps of when a perf test starts and ends on the board, that will be used later to match with the data from netdata

[Carlos Alberto Lopez Perez]

Pull request: https://github.com/WebKit/WebKit/pull/29171

[EWS]

Committed 279378@main (69561296f9ee): <https://commits.webkit.org/279378@main>

Reviewed commits have been landed. Closing PR #29171 and removing active labels.