Bug: ignore empty repos

[jpmcb]

Describe the bug

The pizza service should ignore repos that have empty git repos. For example, for repos like: https://github.com/tamagui/sponsors (which indeed is empty from a public perspective)

This repo throws the following:

{"level":"error","ts":1700591125.6592977,"caller":"server/server.go:103","msg":"Error validating repo URL https://github.com/tamagui/sponsors: could not list remote repository: remote repository is empty","stacktrace":"github.com/open-sauced/pizza/oven/pkg/server.PizzaOvenServer.handleRequest\n\t/app/pkg/server/server.go:103\nnet/http.HandlerFunc.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2136\nnet/http.(*ServeMux).ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2514\nnet/http.serverHandler.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2938\nnet/http.(*conn).serve\n\t/usr/local/go/src/net/http/server.go:2009"}

This gets surfaced in the API as a 400 error

/Users/jpmcb/workspace/opensauced/api.opensauced.pizza/node_modules/axios/lib/core/settle.js:19
    reject(new AxiosError(
           ^
AxiosError: Request failed with status code 400
    at settle (/Users/jpmcb/workspace/opensauced/api.opensauced.pizza/node_modules/axios/lib/core/settle.js:19:12)
    at IncomingMessage.handleStreamEnd (/Users/jpmcb/workspace/opensauced/api.opensauced.pizza/node_modules/axios/lib/adapters/http.js:572:11)
    at IncomingMessage.emit (node:events:526:35)
    at endReadableNT (node:internal/streams/readable:1359:12)
    at processTicksAndRejections (node:internal/process/task_queues:82:21)

Steps to reproduce

1. Run api / app / pizza service locally
2. Attempt to add tamagui/sponsors as a repo in an insights page
3. Notice insights page fail to load

Browsers

No response

Additional context (Is this in dev or production?)

No response

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