* gh-19292:
  Upgrade to Testcontainers 1.12.4

Closes gh-19292

See gh-19292

* gh-19294:
  Reduce visibility of test methods

Closes gh-19294
See gh-19287

See gh-19294
See gh-19287

See gh-19287

Closes gh-19152

Closes gh-18900

Closes gh-19287

Closes gh-19286

Closes gh-19283

Update our Oomph setup to use m2e 1.14.0 from their milestone
update site. Unfortunately we need to use the milestone since
the fix for https://bugs.eclipse.org/bugs/show_bug.cgi?id=548652
has not yet made it into a stable m2e release.

Closes gh-19280

Change the Oomph setup to no longer hide nested Maven projects
so that https://bugs.eclipse.org/bugs/show_bug.cgi?id=553789
doesn't get triggered.

See gh-19280

Upgrade our Oomph setup to use Eclipse 2019.9

See gh-19280

Fixes gh-19219

Closes gh-19070

Closes gh-19247

Closes gh-19246

Closes gh-19245

Closes gh-19244

Closes gh-19243

Closes gh-19242

Closes gh-19241

Closes gh-19240

Closes gh-19239

Closes gh-19238

Closes gh-19237

Closes gh-19072

Closes gh-19068

Closes gh-19234

Closes gh-19233

Closes gh-19232

Closes gh-19231

Closes gh-19230

Closes gh-19229

Closes gh-19228