DM-30682: Rename "flags_negative" to "is_negative"

[abudlong]

No description provided.

[JeremyMcCormick]

I would recommend that these validation errors be fixed if this schema is actually in use:

INFO:felis:Validating ./yml/archive/sdss_stripe82_01.yml
ERROR:felis:3 validation errors for Schema
tables.1.columns.8.ivoa:ucd
  Value error, Invalid IVOA UCD: Unknown word 'pos.equinox' [type=value_error, input_value='pos.equinox', input_type=str]
    For further information visit https://errors.pydantic.dev/2.10/v/value_error
tables.7.columns.9.ivoa:ucd
  Value error, Invalid IVOA UCD: Unknown word 'pos.equinox' [type=value_error, input_value='pos.equinox', input_type=str]
    For further information visit https://errors.pydantic.dev/2.10/v/value_error
tables.7.columns.31.defaultValue
  Extra inputs are not permitted [type=extra_forbidden, input_value='CURRENT_TIMESTAMP', input_type=str]
    For further information visit https://errors.pydantic.dev/2.10/v/extra_forbidden

Because the YAML file is in the archive directory, it will not be validated automatically in CI.

[JeremyMcCormick]

@abudlong

See my comment on DM-30682

You should drop both these commits and start over, as it seems there is confusion about what this ticket is actually supposed to accomplish. The archived schema should not be modified, and apdb.yaml versions are incremented only when there are other changes to that file like adding/deleting columns, etc.

Please discuss in the ticket comments on Jira if you have questions or need clarification on this work.