Error message on line protocol parsing is opaque #26859

See https://github.com/influxdata/EAR/issues/6361#issuecomment-3339942900.

When a write request fails due to catalog limits, the error message in the API response does not include enough detail.

It should include:

• The table name
• More detail about how many columns were attempted to be added, or how many columns would result after the write, as well as the limit of columns per table.