restructure the module a bit so that the order of execution clear

[evgeni]

should also prevent issues with apt::update being scheduled after we try to install the package

Notice: /Stage[main]/Grafana_alloy::Repo/Apt::Source[grafana-alloy]/Apt::Keyring[grafana-alloy]/File[/etc/apt/keyrings/grafana-alloy.asc]/ensure: defined content as '{mtime}2023-08-24 20:03:52 UTC'
Notice: /Stage[main]/Grafana_alloy::Repo/Apt::Source[grafana-alloy]/Apt::Setting[list-grafana-alloy]/File[/etc/apt/sources.list.d/grafana-alloy.list]/ensure: defined content as '{sha256}dc6973392606f49faa1e0e20863dd98b0039f09d79a5a07f20469af0b99f55f3'
Notice: /Stage[main]/Grafana_alloy/File[/etc/alloy/config.alloy]: Dependency Package[alloy] has failures: true
Error: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install alloy' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package alloy
Error: /Stage[main]/Grafana_alloy/Package[alloy]/ensure: change from 'purged' to 'present' failed: Execution of '/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold install alloy' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package alloy
Warning: /Stage[main]/Grafana_alloy/File[/etc/alloy/config.alloy]: Skipping because of failed dependencies
Warning: /Stage[main]/Grafana_alloy/Service[alloy]: Skipping because of failed dependencies
Notice: /Stage[main]/Apt::Update/Exec[apt_update]: Triggered 'refresh' from 1 event

Pull Request (PR) description

This Pull Request (PR) fixes the following issues