[BUG] Filepath sync hangs when a sibling sync fails on startup

[james-milligan]

Observed behavior

When a sync fails on startup no error is thrown, and remaining syncs hang

Expected Behavior

Error log indicating that the file config/samples/I-dont-exist.json does not exist

Steps to reproduce

start flagd with the following command:

./flagd start --uri file:config/samples/example_flags.json --uri file:config/samples/I-dont-exist.json --debug 

output:

1.6752602188585558e+09  debug   runtime/from_config.go:76       using filepath sync-provider for: "file:config/samples/example_flags.json"      {"component": "runtime"}
1.675260218858582e+09   debug   runtime/from_config.go:76       using filepath sync-provider for: "file:config/samples/I-dont-exist.json"       {"component": "runtime"}
1.6752602188586729e+09  info    file/filepath_sync.go:29        Starting filepath sync notifier {"component": "sync", "sync": "filepath"}
1.67526021885871e+09    info    file/filepath_sync.go:29        Starting filepath sync notifier {"component": "sync", "sync": "filepath"}
1.6752602188590488e+09  info    service/connect_service.go:108  metrics listening at 8014       {"component": "service"}

with the console hanging
No response