LUAFDN-784 Try to download all tools before erroring

[hmallen99]

Problem

Closes #37
LUAFDN-784 We should try to download all tools before erroring. Currently, the tool will immediately crash if it finds a tool that it cannot install. This is not great, as a foreman.toml file may list some tools that the user doesn't have auth for, and the user will have to manually delete the entry for that tool.

Solution

Instead of halting execution when we encounter an error, catch the error and add it to an error map. Then we can display all the errors accumulated during execution after all downloads have been attempted.

Testing

Added a snapshot test for downloading all of the tools, even if there's an error in the middle.

[github-actions]

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[hmallen99]

I have read the CLA Document and I hereby sign the CLA

[hmallen99]

This test ends up actually downloading these tools. Is there any way to mock downloading stylua and selene? I want to have a "successful" download alongside the failed ones.

[oltrep]

This is possible yes but you will have to refactor the code to inject a custom ToolProvider implementation. This is probably easier to do within the src code. Tests in tests are considered at least integration level and so they cannot access private members. So if you refactor the code a little, you can write a unit test in main.rs that injects a memory only tool provider

[hmallen99]

I think I'll just add an e2e test with the actual downloads and just test out the download failure here. I don't want the scope of this PR to get too large, so I might just file an issue to inject a mocked tool provider if there isn't one already.