Remove installbuilder from macos release artifact

[umbynos]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• Tests for the changes have been added (for bug fixes / features)

• What kind of change does this PR introduce?

change how the installer is generated

• What is the current behavior?

Fix #739: Currently, the installer for all the platform is generated using installbuilder.

• What is the new behavior?

There is an easier way of doing it: Distributing a DMG, which should be only be presented as a window with the ArduinoCreateAgent app to be draggable inside the Application folder.

• Does this PR introduce a breaking change?

yes, the user before the update process has to manually uninstall the old version of the agent (version <= 1.2.7-ventura). From 1.2.8 onward, the update process should overwrite /Applications/ArduinoCreateAgent

• Other information:

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.28 ⚠️

Comparison is base (71e4921) 11.29% compared to head (28c44ac) 11.02%.

❗ Current head 28c44ac differs from pull request most recent head 9b78c5c. Consider uploading reports for the commit 9b78c5c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #785      +/-   ##
==========================================
- Coverage   11.29%   11.02%   -0.28%     
==========================================
  Files          54       55       +1     
  Lines        3948     4046      +98     
==========================================
  Hits          446      446              
- Misses       3447     3545      +98     
  Partials       55       55              

Flag	Coverage Δ
unit	11.02% <0.00%> (-0.28%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
config/autostart.go	0.00% <0.00%> (ø)
config/config.go	0.00% <0.00%> (ø)
main.go	2.33% <0.00%> (-0.16%)	⬇️

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[umbynos]

Ta daaaah!
Test build here:
ArduinoCreateAgent-1.2.8-rc11-osx-amd64-installer.tar.gz

[cmaglie]

It seems to work fine on vanilla systems, but there are problems if there is an existing installation: previously the Agent was installed in $HOME/Applications, but after dragging the app, it is installed in /Applications, this leaves two installations of the Create Agent that leads to two problems:

1. The user must remove the old installation manually, but there is no clue this must be done.
2. The auto-start file is not updated and still tries to run the old version of the Agent (or if the old version is manually removed it runs nothing).

Two possible solutions for these problems:

1. If a previous installation is in $HOME/Applications/... the new Agent should refuse to run and display a warning asking the user to uninstall the old version first.
2. The new Agent should check if the auto-start file is up-to-date (instead of just checking if the file is present). If it is not updated, replace it with an updated version.

[umbynos]

1. The user must remove the old installation manually, but there is no clue this must be done.

1. If a previous installation is in $HOME/Applications/... the new Agent should refuse to run and display a warning asking the user to uninstall the old version first.

I will target this suggestion in this PR since it's something installbuilder related

Regarding the second point I created #788 to track the imperfection

[umbynos]

This happens when we are upgrading from a version is already using the app bundle format

Every macos app works like this