Refactor duplicate error handling into fetchErrorMessage helper

[Copilot]

What Changed

Extracts duplicate error handling logic for 404/500 status codes in VerifyThenLoadAPIContent into a reusable fetchErrorMessage helper function.

Addresses review feedback from #7642.

Type

• ✨ Feature
• 🐛 Bug fix
• ♻️ Refactor
• 🏗️ Build/Infrastructure
• 🔒 Security

Testing

No functional change. The helper function encapsulates the same AJAX call pattern previously duplicated in both 404 and 500 handlers.

Before (repeated in both handlers):

404: function () {
    try {
        $.ajax({
            method: "GET",
            url: url,
            async: false,
            dataType: "json",
            success: function (data) {
                var msg = data && data.message ? data.message : error;
                window.CRM.DisplayErrorMessage(url, { message: msg });
            },
            error: function () {
                window.CRM.DisplayErrorMessage(url, { message: error });
            },
        });
    } catch (e) {
        window.CRM.DisplayErrorMessage(url, { message: error });
    }
}

After:

404: function () {
    fetchErrorMessage(url, error, function (msg) {
        window.CRM.DisplayErrorMessage(url, { message: msg });
    });
}

Screenshots

N/A - No UI changes

Security Check

• Introduces new input validation
• Modifies authentication/authorization
• Affects data privacy/GDPR

Code Quality

• Database: Propel ORM only, no raw SQL
• No deprecated attributes (align, valign, nowrap, border, cellpadding, cellspacing, bgcolor)
• Bootstrap CSS classes used
• All CSS bundled via webpack

Pre-Merge

• Tested locally
• No new warnings
• Build passes
• Backward compatible (or migration documented)

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[Copilot]

Pull request overview

This PR refactors duplicate error handling logic in VerifyThenLoadAPIContent by extracting repeated AJAX error message fetching code into a reusable fetchErrorMessage helper function. The refactoring addresses code review feedback from PR #7642 and improves code maintainability without introducing any functional changes.

Key Changes:

• Extracted duplicate error handling logic from 404 and 500 status code handlers into a single fetchErrorMessage helper function
• Reduced code duplication by ~40 lines while maintaining identical behavior

Comments suppressed due to low confidence (5)

src/skin/js/CRMJSOM.js:248

• Variable selection is used like a local variable, but is missing a declaration.

                selection = {

src/skin/js/CRMJSOM.js:259

• Variable groupsList is used like a local variable, but is missing a declaration.

            groupsList = rdata.map(function (item) {

src/skin/js/CRMJSOM.js:268

• Variable $groupSelect2 is used like a local variable, but is missing a declaration.

            $groupSelect2 = $("#targetGroupSelection").select2({

src/skin/js/CRMJSOM.js:282

• Variable rolesList is used like a local variable, but is missing a declaration.

                        rolesList = rdata.map(function (item) {

src/skin/js/CRMJSOM.js:297

• Variable params is used like a local variable, but is missing a declaration.

        params = {