Add demo for pde.bnd integration with classic Eclipse product build

[fipro78]

As discussed in #3823 this PR adds a demo for an Eclipse application project that mixes projects with the classical PDE layout with the new pde.bnd integration layout.

[github-actions]

Test Results

  594 files  ±0    594 suites  ±0   3h 58m 24s ⏱️ - 3m 48s
  421 tests ±0    414 ✅ ±0   7 💤 ±0  0 ❌ ±0 
1 263 runs  ±0  1 241 ✅ ±0  22 💤 ±0  0 ❌ ±0 

Results for commit 0518209. ± Comparison against base commit 140bc01.

♻️ This comment has been updated with latest results.

[laeubi]

@fipro78 would you mind adding the demo here:

https://github.com/eclipse-tycho/tycho/blob/main/tycho-its/src/test/java/org/eclipse/tycho/test/DemoTest.java

that way it will be executed with each build, you can even add some assertions about the resulting product / jars ...

[laeubi]

Maybe you want to add it to the global demo readme as well for easier discovery:

https://github.com/eclipse-tycho/tycho/blob/main/demo/README.md

Also a readme in the demo folder itself would make it easier to guess what the demo is about for example like this:

https://github.com/eclipse-tycho/tycho/blob/main/demo/bnd-pde-workspace/README.md

there you can also reference https://newsroom.eclipse.org/eclipse-newsletter/2023/june/notable-improvements-eclipse-ide#Support-for-Automatic-Manifest-Generation so people can better learn about the feature.

[laeubi]

Maybe "pde-automatic-manifest" would be a better folder name for the demo, bnd is used technically but not everyone will probably will care/know about that.

[laeubi]

@fipro78 many thanks for providing a demo project!

[eclipse-tycho-bot]

💚 All backports created successfully

Status	Branch	Result
✅	tycho-4.0.x

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