Loading baseline with EpMonitor doesn't tell it succeded

[doste]

When loading a baseline through a Playground, Metacello doesn't show that it succeded in the installation. In the tab bar of the Playground it shows 'running' just as while the installation was happening.

Steps to reproduce the behavior:

1. Open a Playground.
2. Try to install a baseline, like:

EpMonitor disableDuring: [
  Author useAuthor: 'Load' during: [
    [	Metacello new
        baseline: 'BlocBenchs';
        repository: 'github://pharo-graphics/BlocBenchs:master/src';
        onConflictUseIncoming;
        ignoreImage;
        load.
    ]	on: MCMergeOrLoadWarning
      do: [ :warning | warning load ] ] ]

4. It doesn't tell you it finished, so you have to check manually if the baseline is installed.

Expected behavior: Some kind of feedback that the baseline was successfully loaded.

Version information:

• OS: macOS Sonoma 14.3.1
• Pharo Version: 12

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[hernanmd]

I'm not an expert in Metacello, but from what I've seen, in P13, Metacello loads statements, each one of which is a "script" loaded in a session using dynamic variables (IceMetacelloLoadSessionContext).

To notify successful loading, one could add MCLoadSuccess or MCSuccessLoad.

But there are multiple points where this could be implemented: MetacelloScriptApiExecutor, MetacelloScriptEngine, etc., and someone more knowledgeable could drop some lines here. Maybe @guillep ?