validation-overrides.xml with an allow tag that has an until value of greater than 30 days fails to deploy without an error message

[jackh-ncl]

Describe the bug
I tried to add the following, without first reading the documentation outlined here which describes that until can be at most 30 days in the future:

<validation-overrides>
    <allow until="2024-11-30">field-type-change</allow>
    <allow until="2024-01-30">indexing-change</allow>
</validation-overrides>

I then get the following 400 response without an error message:

$ vespa prepare vespa-config

Uploading application package... failed
Error: invalid application package (status 400)
Invalid application:
indexing-change:
        Document type 'news':
Field 'publisher' changed:
indexing script:
'{ input publisher | tokenize normalize stem:"BEST" | index publisher | summary publisher; }' -> '{ input publisher | for_each { tokenize normalize stem:"BEST" } | index publisher | summary publisher; }'
        Document type 'internal_docs':
Field 'publisher' changed:
indexing script:
'{ input publisher | tokenize normalize stem:"BEST" | index publisher | summary publisher; }' -> '{ input publisher | for_each { tokenize normalize stem:"BEST" } | index publisher | summary publisher; }'
        Document type 'reports':
Field 'publisher' changed:
indexing script:
'{ input publisher | tokenize normalize stem:"BEST" | index publisher | summary publisher; }' -> '{ input publisher | for_each { tokenize normalize stem:"BEST" } | index publisher | summary publisher; }'
        Document type 'intelligence_fusion':
Field 'publisher' changed:
indexing script:
'{ input publisher | tokenize normalize stem:"BEST" | index publisher | summary publisher; }' -> '{ input publisher | for_each { tokenize normalize stem:"BEST" } | index publisher | summary publisher; }'
To allow this add <allow until='yyyy-mm-dd'>indexing-change</allow> to validation-overrides.xml, see https://docs.vespa.ai/en/reference/validation-overrides.html

Once I fix the until date, I can successfully prepare the deployment.

To Reproduce
Steps to reproduce the behavior:

1. Use the validation-overrides.xml from above
2. Run vespa prepare
3. See error

Expected behavior
A useful error message that points out the validation failure of the until date would aid with debugging.

Environment (please complete the following information):

• OS: OS X
• Infrastructure: local docker-compose

Vespa version
Image: vespaengine/vespa:8.444.18
Vespa CLI: 8.441.21

Additional context
Add any other context about the problem here.