remove obsolete `paraviewpluginsexternal`

it was removed in paraview/paraview-superbuild!723
9 jobs for !739 with remove-external-plugin-vestiges in 45 minutes and 36 seconds (queued for 2 seconds)
detached
Status Name Job ID Coverage
  Build
passed build:linux #5056327
build paraview docker linux

00:43:15

passed build:linux_egl #5056328
build paraview docker linux

00:32:52

passed build:linux_osmesa #5056329
build paraview docker linux

00:33:28

passed build:linux_osmesa_static #5056330
build paraview docker linux

00:37:21

 
  Test
failed test:linux #5056331
paraview docker linux x11

00:02:21

failed test:linux_egl #5056332
paraview docker linux x11

00:03:35

failed test:linux_osmesa #5056333
paraview docker linux

00:02:58

failed test:linux_osmesa_static #5056334
paraview docker linux

00:03:13

 
  External
passed ghostflow-check-master

 
Name Stage Failure
failed
test:linux_osmesa_static Test
   Submission successful
CMake Error at /builds/gitlab-kitware-sciviz-ci/.gitlab/ci/ctest_test.cmake:28 (message):
Failed to test


Uploading artifacts...
build/Testing/Temporary/Last*.log: found 7 matching files
Uploading artifacts to coordinator... ok
id=5056334 responseStatus=201 Created token=AAsHzioq
ERROR: Job failed: exit code 1
failed
test:linux_osmesa Test
   Submission successful
CMake Error at /builds/gitlab-kitware-sciviz-ci/.gitlab/ci/ctest_test.cmake:28 (message):
Failed to test


Uploading artifacts...
build/Testing/Temporary/Last*.log: found 7 matching files
Uploading artifacts to coordinator... ok
id=5056333 responseStatus=201 Created token=2jTytTrR
ERROR: Job failed: exit code 1
failed
test:linux_egl Test
   Submission successful
CMake Error at /builds/gitlab-kitware-sciviz-ci/.gitlab/ci/ctest_test.cmake:28 (message):
Failed to test


Uploading artifacts...
build/Testing/Temporary/Last*.log: found 7 matching files
Uploading artifacts to coordinator... ok
id=5056332 responseStatus=201 Created token=G7gsfMtQ
ERROR: Job failed: exit code 1
failed
test:linux Test
   Submission successful
CMake Error at /builds/gitlab-kitware-sciviz-ci/.gitlab/ci/ctest_test.cmake:28 (message):
Failed to test


Uploading artifacts...
build/Testing/Temporary/Last*.log: found 8 matching files
Uploading artifacts to coordinator... ok
id=5056331 responseStatus=201 Created token=z9of5FHU
ERROR: Job failed: exit code 1