Include option to print results of all checks in `check_for_errors`

[annakrystalli]

Currently output of check_for_errors either prints a single ✔ if all checks pass or the output of only failing checks if any fail.

Include a verbose option that prints the result of all checks prior to the summary.

[annakrystalli]

How does this look for a verbose output @nickreich @rborchering @elray1 ?

── Individual check results ──

✔ FluSight-forecast-hub: All hub config files are valid.
✔ 2023-10-14-UMass-trends_ensemble.csv: File exists at path
  model-output/UMass-trends_ensemble/2023-10-14-UMass-trends_ensemble.csv.
✔ 2023-10-14-UMass-trends_ensemble.csv: File name "2023-10-14-UMass-trends_ensemble.csv" is valid.
✔ 2023-10-14-UMass-trends_ensemble.csv: File directory name matches `model_id` metadata in file name.
✔ 2023-10-14-UMass-trends_ensemble.csv: `round_id` is valid.
✔ 2023-10-14-UMass-trends_ensemble.csv: File is accepted hub format.
✖ 2023-10-14-UMass-trends_ensemble.csv: Metadata file does not exist at path
  model-metadata/UMass-trends_ensemble.yml or model-metadata/UMass-trends_ensemble.yaml.

── Overall validation result ──────────────────────────────────────────────────────────────────────────────
✖ 2023-10-14-UMass-trends_ensemble.csv: Metadata file does not exist at path
  model-metadata/UMass-trends_ensemble.yml or model-metadata/UMass-trends_ensemble.yaml.
Error in `check_for_errors()`:
! 
The validation checks produced some failures/errors reported above.
Run `rlang::last_trace()` to see where the error occurred.

[nickreich]

I like it!

[elray1]

agree :)