[CDF-25657]  Remove metadata not string values errors (#1900)

# Description

We see multiple cases that this is causing error fatigue. See comment in
code for why we do this.

## Changelog

- [x] Patch
- [ ] Skip

## cdf

### Improved

- When running `cdf build`, Toolkit no longer gives warnings if a
resource with metadata does not have values that are string.

## templates

No changes.
