Remove Eclipse Web Tools Platform (WTP) configuration

Since the team no longer needs the ability to treat Eclipse projects as
WTP modules, this commit removes the obsolete custom WTP configuration
for importing projects into Eclipse IDE.

See gh-27407

gradle/ide.gradle

@@ -69,38 +69,20 @@ eclipse.classpath.file.whenMerged {
 	}
 }
 
-// Allow projects to be used as WTP modules
-eclipse.project.natures 'org.eclipse.wst.common.project.facet.core.nature'
-
 // Include project specific settings
 task eclipseSettings(type: Copy) {
 	from rootProject.files(
-		'src/eclipse/org.eclipse.jdt.ui.prefs',
-		'src/eclipse/org.eclipse.wst.common.project.facet.core.xml')
+		'src/eclipse/org.eclipse.jdt.core.prefs',
+		'src/eclipse/org.eclipse.jdt.ui.prefs')
 	into project.file('.settings/')
 	outputs.upToDateWhen { false }
 }
 
-task eclipseJdtSettings(type: Copy) {
-	from rootProject.file('src/eclipse/org.eclipse.jdt.core.prefs')
-	into project.file('.settings/')
-	outputs.upToDateWhen { false }
-}
-
-task eclipseWstComponentSettings(type: Copy) {
-	from rootProject.files('src/eclipse/org.eclipse.wst.common.component')
-	into project.file('.settings/')
-	expand(deployname: project.name)
-	outputs.upToDateWhen { false }
-}
-
 task cleanEclipseSettings(type: Delete) {
 	delete project.file('.settings/org.eclipse.jdt.core.prefs')
 	delete project.file('.settings/org.eclipse.jdt.ui.prefs')
-	delete project.file('.settings/org.eclipse.wst.common.component')
-	delete project.file('.settings/org.eclipse.wst.common.project.facet.core.xml')
 }
 
-tasks['eclipse'].dependsOn(eclipseSettings, eclipseJdtSettings, eclipseWstComponentSettings)
-tasks['eclipseJdt'].dependsOn(eclipseJdtSettings)
+tasks['eclipse'].dependsOn(eclipseSettings)
+tasks['eclipseJdt'].dependsOn(eclipseSettings)
 tasks['cleanEclipse'].dependsOn(cleanEclipseSettings)

src/eclipse/org.eclipse.wst.common.component

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?><project-modules id="moduleCoreId" project-version="1.5.0">
-    <wb-module deploy-name="${deployname}">
-        <wb-resource deploy-path="/" source-path="/src/main/java"/>
-        <wb-resource deploy-path="/" source-path="/src/main/resources"/>
-    </wb-module>
-</project-modules>

src/eclipse/org.eclipse.wst.common.project.facet.core.xml

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<faceted-project>
-  <fixed facet="jst.utility"/>
-  <fixed facet="java"/>
-  <installed facet="jst.utility" version="1.0"/>
-  <installed facet="java" version="1.8"/>
-</faceted-project>