Stop using setGitDate and rely on buildtime for qualifiers

RELEASING.md

@@ -72,15 +72,7 @@ Scroll down for the per-milestone/RC steps.
   - [ ] Update `SIMREL_REPO` in `releng/org.eclipse.epp.config/parent/pom.xml` if not done above.
   - [ ] Or use the `Run` toolbar button drop-down menu to launch the `Update to Milestone Repository` launch configuration.
         This will automatically determine the correct update site URL and will create an appropriate commit message in the system clipboard.
-- [ ] Update the build qualifiers to ensure that packages are all updated.
-      See this [gerrit](https://git.eclipse.org/r/#/c/161075/) for an example.
-      Commit all other changes before this step because this step will automatically create a Git commit specifically for the forced qualifier changes.
-      Use the `External Tools` toolbar drop-down menu to launch the `Update Qualifiers` launch configuration.
-      This runs the [setGitDate](releng/org.eclipse.epp.config/tools/setGitDate) bash script.
-      This script will make a local commit you need to push; **do not amend it** because the timestamp is relevant.
-  - In some cases a respin/rebuild is needed and setGitDate needs to be run again.
-    In that case you may need to manually add a minute or two to the applied timestamp in the script.
-- [ ] Push the two commits on the new branch to your fork in order to launch a verification build and then merge the result to `main`.
+- [ ] Push the commit on the new branch to your fork in order to launch a verification build and then merge the result to `main`.
 - [ ] Run a [CI build](https://ci.eclipse.org/packaging/job/epp/job/master/) that includes the above changes.
   - If the build fails there may be the opportunity to continue the build rather than restart it.
     This is relatively underused option but enabled by the multi-step Jenkins build in the Jenkinsfile.

releng/org.eclipse.epp.config/oomph/EPP.setup

@@ -432,23 +432,6 @@
       value="${bash.location}">
     <description>The location of the bash command that will execute bash on your operating system; it is used in the External Tools Configurations.</description>
   </setupTask>
-  <setupTask
-      xsi:type="setup:ResourceCreationTask"
-      targetURL="${workspace.location|uri}/.metadata/.plugins/org.eclipse.debug.core/.launches/Update%20Qualifiers.launch">
-    <content>
-      &lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?>
-      &lt;launchConfiguration type=&quot;org.eclipse.ui.externaltools.ProgramLaunchConfigurationType&quot;>
-          &lt;booleanAttribute key=&quot;org.eclipse.debug.core.ATTR_FORCE_SYSTEM_CONSOLE_ENCODING&quot; value=&quot;false&quot;/>
-          &lt;mapAttribute key=&quot;org.eclipse.debug.core.environmentVariables&quot;>
-              &lt;mapEntry key=&quot;PATH&quot; value=&quot;C:\Program Files\Git\bin;$${env_var:PATH}&quot;/>
-          &lt;/mapAttribute>
-          &lt;stringAttribute key=&quot;org.eclipse.ui.externaltools.ATTR_LOCATION&quot; value=&quot;C:\Program Files\Git\bin\bash.exe&quot;/>
-          &lt;stringAttribute key=&quot;org.eclipse.ui.externaltools.ATTR_TOOL_ARGUMENTS&quot; value=&quot;-c releng/org.eclipse.epp.config/tools/setGitDate&quot;/>
-          &lt;stringAttribute key=&quot;org.eclipse.ui.externaltools.ATTR_WORKING_DIRECTORY&quot; value=&quot;$${workspace_loc:/org.eclipse.epp.packages}&quot;/>
-      &lt;/launchConfiguration>
-
-    </content>
-  </setupTask>
   <setupTask
       xsi:type="setup:ResourceCreationTask"
       targetURL="${workspace.location|uri}/.metadata/.plugins/org.eclipse.debug.core/.launches/Prepare%20Staging%20Sanity%20Check.launch">

releng/org.eclipse.epp.config/parent/pom.xml

@@ -176,20 +176,13 @@
         <groupId>org.eclipse.tycho</groupId>
         <artifactId>tycho-packaging-plugin</artifactId>
         <dependencies>
-          <dependency>
-            <groupId>org.eclipse.tycho</groupId>
-            <artifactId>tycho-buildtimestamp-jgit</artifactId>
-            <version>${tycho.version}</version>
-          </dependency>
           <dependency>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-sourceref-jgit</artifactId>
             <version>${tycho.version}</version>
           </dependency>
         </dependencies>
         <configuration>
-          <timestampProvider>jgit</timestampProvider>
-          <jgit.dirtyWorkingTree>ignore</jgit.dirtyWorkingTree>
           <format>yyyyMMdd-HHmm</format>
           <sourceReferences>
             <generate>true</generate>