[JENKINS-76002] Apply number instead of string comparison

[jeromepochat]

The min-max validator is using string comparison. This makes the form validation skipped when min is wrongly considered greater than max. The number comparison must be used instead.

For example:

• String comparison:"5" is greater than "10"
• Number comparison: 5 is lower than 10

See JENKINS-76002.

Testing done

I updated "# of executors" form with:

<f:number min="10" max="20" clazz="non-negative-number-required" step="1"/>

Before

Validation is skipped:

After

Validation is applied:

Proposed changelog entries

• Fix number comparison in min/max form validator.

Proposed changelog category

/label bug

Proposed upgrade guidelines

N/A

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Desired reviewers

@mention

Before the changes are marked as ready-for-merge:

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[timja]

Thanks! LGTM

[timja]

/label ready-for-merge

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This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.

Thanks!

[A1exKH]

LGTM.