feat: add licenses.validate endpoint to preview a license before applying

[rodrigok]

Adds a new POST /api/v1/licenses.validate REST endpoint that validates a Rocket.Chat license (V2 or V3 JWT) against the current workspace's validation structure without applying it, so the result can be previewed from the UI before the license is committed.

• core-typings: new LicenseValidationResult type
• license: LicenseManager.validateLicenseForPreview() runs the same validation pipeline used on apply (URL, periods, limits) without mutating state or emitting events; the shared licenseValidationBehaviors constant is reused by both the apply and preview paths to avoid duplication
• rest-typings: isLicensesValidateProps schema + endpoint typing
• meteor: licenses.validate route (edit-privileged-setting)

Proposed changes (including videos or screenshots)

Issue(s)

Steps to test or reproduce

Further comments

CORE-2104

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[changeset-bot]

🦋 Changeset detected

Latest commit: 93bc1b7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@rocket.chat/core-typings	Minor
@rocket.chat/license	Minor
@rocket.chat/rest-typings	Minor
@rocket.chat/meteor	Minor

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.17%. Comparing base (021f169) to head (93bc1b7).
⚠️ Report is 16 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #40858      +/-   ##
===========================================
- Coverage    70.17%   70.17%   -0.01%     
===========================================
  Files         3341     3341              
  Lines       123645   123572      -73     
  Branches     22050    22412     +362     
===========================================
- Hits         86765    86711      -54     
+ Misses       33539    33504      -35     
- Partials      3341     3357      +16     

Flag	Coverage Δ
e2e	59.38% <ø> (-0.05%)	⬇️
e2e-api	46.70% <ø> (+0.41%)	⬆️
unit	70.96% <80.00%> (-0.04%)	⬇️

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