Enable JSPCD linting

Turn on `VALIDATE_JSCPD` in the [super-linter GitHub Action](https://github.com/github/super-linter) and address the issues it finds. Current output:

```
Run github/super-linter@v3
/usr/bin/docker run --name ghcriogithubsuperlinterv3145_502450 --label 5588e4 --workdir /github/workspace --rm -e pythonLocation -e VALIDATE_ALL_CODEBASE -e DEFAULT_BRANCH -e GITHUB_TOKEN -e HOME -e GITHUB_JOB -e GITHUB_REF -e GITHUB_SHA -e GITHUB_REPOSITORY -e GITHUB_REPOSITORY_OWNER -e GITHUB_RUN_ID -e GITHUB_RUN_NUMBER -e GITHUB_RETENTION_DAYS -e GITHUB_ACTOR -e GITHUB_WORKFLOW -e GITHUB_HEAD_REF -e GITHUB_BASE_REF -e GITHUB_EVENT_NAME -e GITHUB_SERVER_URL -e GITHUB_API_URL -e GITHUB_GRAPHQL_URL -e GITHUB_WORKSPACE -e GITHUB_ACTION -e GITHUB_EVENT_PATH -e GITHUB_ACTION_REPOSITORY -e GITHUB_ACTION_REF -e GITHUB_PATH -e GITHUB_ENV -e RUNNER_OS -e RUNNER_TOOL_CACHE -e RUNNER_TEMP -e RUNNER_WORKSPACE -e ACTIONS_RUNTIME_URL -e ACTIONS_RUNTIME_TOKEN -e ACTIONS_CACHE_URL -e GITHUB_ACTIONS=true -e CI=true -v "/var/run/docker.sock":"/var/run/docker.sock" -v "/home/runner/work/_temp/_github_home":"/github/home" -v "/home/runner/work/_temp/_github_workflow":"/github/workflow" -v "/home/runner/work/_temp/_runner_file_commands":"/github/file_commands" -v "/home/runner/work/ITKExamples/ITKExamples":"/github/workspace" ghcr.io/github/super-linter:v3.14.5
--------------------------------------------------------------------------------

/@@#///////@@/(@//@%/(@.@( @@
@@//////////////////////////////#* @@@
@////@//(///////////@@@@@///@//@/@**//@@(
@///////@///////////////@@@@ ( @,
@/(&/@//////////////////// @
@////////////////////////@@ @
@%////////(//////////%/////&@ @@ *,@ ______________
@@@@@/@/#/////(&////////////////// .@ / \
*@@@@@. .%///(//@//////////////////&. .@@, @% / Don't mind me \
@@% .&@&&/@.@//&/////(////////// @@@@@@@@@ .. &@ / I'm just looking \
@@% @@@@@ @&/////////////////# @/ V @@/ ,@@@ @ < for some trash... |
@@@% @@@@ .%@@@@//////#@ @ @@ @ .,. \__________________/
@@@/@( (@@@@% @/\ %
@@@@( . .@@/\ #
@ %@%

--------------------------------------------------------------------------------
2021-03-16 02:12:45 [INFO] ---------------------------------------------
2021-03-16 02:12:45 [INFO] --- GitHub Actions Multi Language Linter ----
2021-03-16 02:12:45 [INFO] - Image Creation Date:[2021-01-30T05:18:38Z]
2021-03-16 02:12:45 [INFO] - Image Revision:[93e067cf8298498f3eb01853db18839d933b0eee]
2021-03-16 02:12:45 [INFO] - Image Version:[93e067cf8298498f3eb01853db18839d933b0eee]
2021-03-16 02:12:45 [INFO] ---------------------------------------------
2021-03-16 02:12:45 [INFO] ---------------------------------------------
2021-03-16 02:12:45 [INFO] The Super-Linter source code can be found at:
2021-03-16 02:12:45 [INFO] - https://github.com/github/super-linter
2021-03-16 02:12:45 [INFO] ---------------------------------------------
2021-03-16 02:12:45 [INFO] --------------------------------------------
2021-03-16 02:12:45 [INFO] Gathering GitHub information...
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_SHA], value:[74142c32611a912d72946fd8f543e14524b5c481]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_WORKSPACE], value:[/github/workspace]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_EVENT_PATH], value:[/github/workflow/event.json]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_ORG], value:[InsightSoftwareConsortium]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_REPO], value:[ITKExamples]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_TOKEN]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_REPOSITORY], value:[InsightSoftwareConsortium/ITKExamples]
2021-03-16 02:12:45 [INFO] Successfully found:[GITHUB_RUN_ID], value:[656102740]
2021-03-16 02:12:45 [INFO] --------------------------------------------
2021-03-16 02:12:45 [INFO] Gathering user validation information...
2021-03-16 02:12:45 [INFO] - Only validating [new], or [edited] files in code base...
You are not currently on a branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

git pull

2021-03-16 02:12:50 [INFO] ---------------------------------
2021-03-16 02:12:50 [INFO] ------ File list to check: ------
2021-03-16 02:12:50 [INFO] ---------------------------------
2021-03-16 02:12:50 [INFO] ----------------------------------------------
2021-03-16 02:12:50 [INFO] Successfully gathered list of files...
2021-03-16 02:12:51 [INFO]
2021-03-16 02:12:51 [INFO] ----------------------------------------------
2021-03-16 02:12:51 [INFO] ----------------------------------------------
2021-03-16 02:12:51 [INFO] Linting [JSCPD] files...
2021-03-16 02:12:51 [INFO] ----------------------------------------------
2021-03-16 02:12:51 [INFO] ----------------------------------------------
2021-03-16 02:12:51 [INFO] ---------------------------
2021-03-16 02:12:51 [INFO] File:[.github/workflows/build-test-publish.yml]
2021-03-16 02:12:52 [ERROR] Found errors in [jscpd] linter!
2021-03-16 02:12:52 [ERROR] Error code: 1. Command output:
------
Clone found (yaml):
- /github/workspace/.github/workflows/build-test-publish.yml [162:7 - 239:30] (77 lines, 156 tokens)
/github/workspace/.github/workflows/build-test-publish.yml [42:7 - 113:30]

Clone found (yaml):
- /github/workspace/.github/workflows/build-test-publish.yml [253:23 - 289:45] (36 lines, 218 tokens)
/github/workspace/.github/workflows/build-test-publish.yml [125:20 - 160:45]

Clone found (yaml):
- /github/workspace/.github/workflows/build-test-publish.yml [162:7 - 239:30] (77 lines, 156 tokens)
/github/workspace/.github/workflows/build-test-publish.yml [42:7 - 113:30]

162 │ 42 │ - name: Get specific version of CMake, Ninja
163 │ 43 │ uses: lukka/get-cmake@v3.18.3
164 │ 44 │
165 │ 45 │ - name: Download ITK
166 │ 46 │ run: |
167 │ 47 │ cd ..
168 │ 48 │ git clone https://github.com/InsightSoftwareConsortium/ITK.git
169 │ 49 │ cd ITK
170 │ 50 │ git checkout ${{ matrix.itk-git-tag }}
171 │ 51 │
172 │ 52 │ - name: Build ITK
173 │ 53 │ if: matrix.os != 'windows-2019'
174 │ 54 │ run: |
175 │ 55 │ cd ..
176 │ 56 │ mkdir ITK-build
177 │ 57 │ cd ITK-build
178 │ 58 │ cmake -DCMAKE_C_COMPILER:FILEPATH="${{ matrix.c-compiler }}" -DBUILD_SHARED_LIBS:BOOL=ON -DCMAKE_CXX_COMPILER="${{ matrix.cxx-compiler }}" -DCMAKE_BUILD_TYPE:STRING=${{ matrix.cmake-build-type }} -DBUILD_TESTING:BOOL=OFF -GNinja ../ITK
229 │ 109 │ set(dashboard_cache "
230 │ 110 │ ITK_DIR:PATH=\${CTEST_DASHBOARD_ROOT}/ITK-build
231 │ 111 │ BUILD_TESTING:BOOL=ON
232 │ 112 │ ITK_WRAP_PYTHON:BOOL=ON
233 │ 113 │ ")
234 │ 114 │ string(TIMESTAMP build_date "%Y-%m-%d")
235 │ 115 │ message("CDash Build Identifier: \${build_date} \${CTEST_BUILD_NAME}")
236 │ 116 │ message("CTEST_SITE = \${CTEST_SITE}")
237 │ 117 │ include(\${CTEST_SCRIPT_DIRECTORY}/itk_common.cmake)
238 │ 118 │ EOF
239 │ 119 │ cat dashboard.cmake

Clone found (yaml):
- /github/workspace/.github/workflows/build-test-publish.yml [253:23 - 289:45] (36 lines, 218 tokens)
/github/workspace/.github/workflows/build-test-publish.yml [125:20 - 160:45]

253 │ 125 │ :
254 │ 126 │ runs-on: ${{ matrix.os }}
255 │ 127 │ strategy:
256 │ 128 │ max-parallel: 3
257 │ 129 │ matrix:
258 │ 130 │ os: [ubuntu-18.04, windows-2019, macos-10.15]
259 │ 131 │ include:
260 │ 132 │ - os: ubuntu-18.04
261 │ 133 │ c-compiler: "gcc"
262 │ 134 │ cxx-compiler: "g++"
263 │ 135 │ itk-git-tag: "v5.2rc03"
264 │ 136 │ cmake-build-type: "MinSizeRel"
265 │ 137 │ - os: windows-2019
266 │ 138 │ c-compiler: "cl.exe"
267 │ 139 │ cxx-compiler: "cl.exe"
268 │ 140 │ itk-git-tag: "v5.2rc03"
269 │ 141 │ cmake-build-type: "Release"
270 │ 142 │ - os: macos-10.15
271 │ 143 │ c-compiler: "clang"
272 │ 144 │ cxx-compiler: "clang++"
273 │ 145 │ itk-git-tag: "v5.2rc03"
274 │ 146 │ cmake-build-type: "MinSizeRel"
275 │ 147 │
276 │ 148 │ steps:
277 │ 149 │ - uses: actions/checkout@v1
278 │ 150 │ - name: Set up Python 3.7
279 │ 151 │ uses: actions/setup-python@v1
280 │ 152 │ with:
281 │ 153 │ python-version: 3.7
282 │ 154 │
283 │ 155 │ - name: Install build dependencies
284 │ 156 │ run: |
285 │ 157 │ python -m pip install --upgrade pip
286 │ 158 │ python -m pip install ninja
287 │ 159 │ python -m pip install itk==5.2rc03
288 │ 160 │ python -m pip install matplotlib
289 │ 161 │ python -m pip install itkwidgets

Found 2 clones.
ERROR: jscpd found too many duplicates (26.53%) over threshold (0%)
Error: ERROR: jscpd found too many duplicates (26.53%) over threshold (0%)
at ThresholdReporter.report (/node_modules/@jscpd/finder/dist/reporters/threshold.js:12:19)
at /node_modules/@jscpd/finder/dist/in-files-detector.js:82:26
at Array.forEach ()
at /node_modules/@jscpd/finder/dist/in-files-detector.js:81:28
```