[Frontend] Data Upload: Error/Warning Page

[mxosman]

Description of the change

Fleshes out the Error/Warning page. There are a two main types of errors that can occur after an upload:

1. Pre-ingest errors (errors that occur when the file cannot be properly parsed)
2. Metric errors and/or warnings that occur within the sheets of the Excel file

If an upload has only warnings (and no errors), the user will have a Continue button that will enable them to continue to the confirmation page.

Uploading a file that only has warnings (lorem ipsum for now - would love copy ideas):

WarningsOnly.mov

Uploading a file that has metric errors & a file that generates pre-ingest errors:

Metric.Errors.and.PreIngest.Errors.mov

Related issues

Closes #18

Checklists

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[mxosman]

Right now, I'm doing an either/or with the metric errors and the pre-ingest errors, where the pre-ingest errors take precedence over the metric errors with regards to being displayed. So, if there are both metric errors and pre-ingest errors, the error page will only display the pre-ingest errors (not sure if we'll ever reach a state where both pre-ingest and metric errors are displayed). Please let me know if I should handle this differently.

[lilidworkin]

Looking awesome!!