Fix eval with exclusions

[johnalotoski]

• Adds an exclusions.json file to exclude packages that are known to not build.
• Exclusions are added as key value pairs with the key being the flake_url string and the value being a build failure reason string.
• The packages.cr script was updated to utilize the exclusions file and ignore packages with a matching flake_url.
• Packages.cr was also updated to ignore draft PRs which may get returned when using local netrc credentials, causing exceptions
• A new just recipe was added: filter-packages to remove packages that match exclusions from exclusions.json
• The remaining recipes were sorted and a description added to those which didn't already have it
• Go package exclusions were re-added after the missing hydra go deps were re-cached
• Other exclusions still present might possibly be fixed in the future and re-added

[manveru]

Nice one