[JENKINS-74858] Added validation for Password length in FIPS mode

[tejasdrolia]

See JENKINS-74858.

Made changes to ensure that an exisiting user is now unable to alter the password to less than 14 characters in length when operating in FIPS mode.

Testing done

Automated Unit Testing
Implemented unit tests to verify FIPS compliance for password changes:

1. Ensured that passwords shorter than 14 characters are rejected when FIPS mode is enabled.
2. Verified that mismatched passwords between user.password and user.password2 trigger appropriate errors.

Manual Testing
Did Manual testing to verify my changes to ensure that everything is working properly.

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Without FIPS mode: Shorter password is being accepted.

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With FIPS mode: Shorter password is not being accepted.

Proposed changelog entries

• Added Password validation to ensure that existing users cannot create a password of less than 14 characters in length(when in FIPS mode).

Proposed upgrade guidelines

N/A

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3. There is automated testing or an explanation as to why this change has no tests.
4. New public classes, fields, and methods are annotated with @Restricted or have @since TODO Javadocs, as appropriate.
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7. For dependency updates, there are links to external changelogs and, if possible, full differentials.
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Desired reviewers

@mention

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

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[daniel-beck]

Would be nice if newly added tests covered the success case (long + matching password) in addition to not relying on mocks.

[fcojfernandez]

You have spotless issues, just execute mvn clean install -DskipTests to see and fix them

(haven't see them clearly in the CI logs, but they seem to be related to my comments about the empty line and the wildcard)

[pankajy-dev]

LGTM

[tejasdrolia]

@MarkEWaite @basil
Can you guys help in getting this PR merged?

[fcojfernandez]

@jenkinsci/core-pr-reviewers any chance to get help to get this merged?

[res0nance]

LGTM, I've set the ready for merge label. I'll be away for a few days but someone else can feel free to merge this in 24 hours if nothing comes up. Else I'll merge this when I'm back

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