Revert "Run some pde.build tests with Tycho"

This reverts commit 6e5138a as it will
introduce cyclic build error in the aggregator build.

See eclipse-platform/eclipse.platform.releng.aggregator#1639
See eclipse-pde#980

build/org.eclipse.pde.build.tests/META-INF/MANIFEST.MF

@@ -14,8 +14,7 @@ Require-Bundle: org.eclipse.core.runtime,
  org.apache.ant,
  org.eclipse.debug.core,
  org.eclipse.equinox.p2.publisher;bundle-version="1.1.0",
- org.eclipse.equinox.p2.publisher.eclipse;bundle-version="1.0.0",
- org.eclipse.equinox.p2.repository.tools
+ org.eclipse.equinox.p2.publisher.eclipse;bundle-version="1.0.0"
 Bundle-RequiredExecutionEnvironment: JavaSE-17
 Import-Package: org.eclipse.equinox.frameworkadmin;version="2.0.0",
  org.eclipse.equinox.internal.p2.artifact.repository,

build/org.eclipse.pde.build.tests/build.properties

@@ -20,4 +20,5 @@ bin.includes = META-INF/,\
                test.xml
 src.includes = about.html
 jars.compile.order = .
+pom.model.property.skipTests = true
 pom.model.property.code.ignoredWarnings = ${tests.ignoredWarnings}