Fix rank_properties to not quote numeric values

[Copilot]

Numeric values (int/float) in rank_properties were being incorrectly wrapped in quotes in the generated schema, violating Vespa schema syntax.

Before:

RankProfile(
    name="default",
    first_phase="closeness(label,nns)",
    rank_properties=[
        ("approximate-threshold", 0.05),
        ("filter-first-threshold", 0.0),
    ],
)

Generated:

rank-properties {
    approximate-threshold: "0.05"
    filter-first-threshold: "0.0"
}

After:

rank-properties {
    approximate-threshold: 0.05
    filter-first-threshold: 0.0
}

Changes

• Modified vespa/templates/schema.txt to conditionally quote rank_properties values using Jinja2's is number test
  • Numeric values (int, float) render unquoted
  • String values remain quoted
• Added unit tests covering numeric-only, string-only, and mixed-type scenarios

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Do not wrap rank_properties with float/int-type in quotes</issue_title>
<issue_description>Current behavior:

# Define the rank profile with HNSW tuning parameters
rank_profile = RankProfile(
    name="default",
    first_phase="closeness(label,nns)",
    rank_properties=[
        ("approximate-threshold", 0.05),
        ("filter-first-threshold", 0.0),
        ("filter-first-exploration", 0.3),
        ("exploration-slack", 0.0),
    ],
)

generates schema like:

rank-profile default {
        first-phase {
            expression {
                closeness(label,nns)
            }
        }
        rank-properties {
            approximate-threshold: "0.05"
            filter-first-threshold: "0.0"
            filter-first-exploration: "0.3"
            exploration-slack: "0.0"
        }
    }

Still can be deployed and works, but we should avoid quoting for numeric values.
Maybe this is done several places as well.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Do not wrap rank_properties with float/int-type in quotes #1159

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