refactor: drop legacy rs/jquery + drop resource-server-content overlay

[bjagg]

Summary

Three commits — release-plugin commits from a prior 2.1.1 release cycle that didn't get pushed, plus the actual work:

1. da39d63 — release plugin prep for 2.1.1 (already-released)
2. 0453e6f — release plugin post-2.1.1 SNAPSHOT bump
3. 677110b (prior) — drop legacy rs/jquery loads + retire <rs:compressJs> taglib wrappers; the source-side consolidation.
4. 9df8b28 (new) — drop the resource-server-content WAR overlay (dep + maven-war-plugin extract). The overlay was unpacking lodash 4.17.4 (4 CVEs), underscore, backbone, modernizr, normalize, and jquery-plugins into the WAR for nothing, plus an explicit extract of rs/jquery/1.6.1/ and rs/jqueryui/1.8.13/ — none referenced after 677110b.

Why this is safe

• grep -rEn '/CoursesPortlet/rs/' courses-portlet-webapp/src/ returns no matches after 677110b.
• jQuery is loaded by uPortal core's chrome via /resource-server/webjars/jquery/....

Test plan

• mvn clean install -DskipTests builds (verified locally on Java 11)
• WAR has no rs/ directory (verified)
• Smoke: /p/courses/?pCm=view and admin views render without missing-resource errors

[Naenyn]

I believe a little more needs to happen in order for this portlet to work properly with the resource-server updates:

The core issue is that CoursesPortlet's JavaScript still does jQuery.noConflict(true) which steals the global jQuery reference, and its resources.xml aggregates JS files (like jquery.log.js and debug.js) that reference bare jQuery — but no jQuery is actually bundled with the portlet anymore since the old overlay paths (rs/jquery/1.6.1/) don't exist in the current resource-server-content.

The pattern used by working portlets (like CalendarPortlet) is simple: they just use up.jQuery (the portal-provided jQuery) and don't try to bundle their own.

Here's what needs to happen in CoursesPortlet:

1. coursesPortlet.js — remove the noConflict(true) pattern and just use up.jQuery:

// Old (broken):
if (!coursesPortlet.jQuery) {
    coursesPortlet.jQuery = jQuery.noConflict(true);
}

// New:
if (!coursesPortlet.jQuery) {
    coursesPortlet.jQuery = up.jQuery;
}

2. debug.js — use up.jQuery instead of bare jQuery:

(function ($) {
    "use strict";
    $.debug(true);
}(up.jQuery));
3. jquery.log.js — same issue, the IIFE wraps with })(jQuery) at the bottom. Needs to be })(up.jQuery).

4. 

pom.xml
 — the overlay still references rs/jquery/1.6.1/ and rs/jqueryui/1.8.13/ which no longer exist. Those includes should be removed.

The PR's resources.xml comment says the old jQuery was removed, but the JS files weren't updated to stop expecting a bundled jQuery. 

[Naenyn]

Please see my comment here: #113 (comment)