dotnet cake --tree requires manual bootstrapping of modules

`dotnet cake --tree` on Cake v1.0.0 doesn't work if the build script rely on modules that introduce new installers

### What You Are Seeing?


### What is Expected?


### What version of Cake are you using?

1.0.0

### Are you running on a 32 or 64 bit system?

N/A

### What environment are you running on? Windows? Linux? Mac?

N/A

### Are you running on a CI Server? If so, which one?

N/A

### How Did You Get This To Happen? (Steps to Reproduce)

```csharp
#module nuget:?package=Cake.DotNetTool.Module&version=0.4.0
#tool "dotnet:https://api.nuget.org/v3/index.json?package=GitReleaseManager.Tool&version=0.11.0"

Task("Clean")
.Does(() =>
{
Information("We're {0}!", "Cleaning");
});

Task("Build")
.IsDependentOn("Clean")
.Does(() =>
{
Information("We're {0}!", "Building");
});

RunTarget("Build");
```

### Output Log

```bash
Module directory does not exist.
Analyzing build script...
Analyzing /Users/augustoproiete/cake/tool/1.0.0/test-tree.cake...
Processing build script...
Installing tools...
Error: Cake.Core.CakeException: Could not find an installer for the 'dotnet' scheme.
at Cake.Core.Scripting.ScriptProcessor.InstallPackages(IReadOnlyCollection`1 modules, DirectoryPath installPath, PackageType packageType) in C:\projects\cake\src\Cake.Core\Scripting\ScriptProcessor.cs:line 195
at Cake.Core.Scripting.ScriptProcessor.InstallTools(IReadOnlyCollection`1 tools, DirectoryPath installPath) in C:\projects\cake\src\Cake.Core\Scripting\ScriptProcessor.cs:line 136
at Cake.Core.Scripting.ScriptRunner.Run(IScriptHost host, FilePath scriptPath) in C:\projects\cake\src\Cake.Core\Scripting\ScriptRunner.cs:line 102
at Cake.Features.Building.BuildFeature.RunCore(IRemainingArguments arguments, BuildFeatureSettings settings) in C:\projects\cake\src\Cake\Features\Building\BuildFeature.cs:line 99
at Cake.Features.Building.BuildFeature.Run(IRemainingArguments arguments, BuildFeatureSettings settings) in C:\projects\cake\src\Cake\Features\Building\BuildFeature.cs:line 49
at Cake.Commands.DefaultCommand.Execute(CommandContext context, DefaultCommandSettings settings) in C:\projects\cake\src\Cake\Commands\DefaultCommand.cs:line 72
```

Start with the ScriptProcessor.InstallPackages and InstallTools stack-trace locations in src/Cake.Core/Scripting/ScriptProcessor.cs, then trace how BuildFeature invokes script processing for --tree. Reproduce with the supplied build script and verify that the module-provided installer is available before the dotnet tool is processed, with the expected tree output and no installer error.

Written by the indexing model from the issue text.