Remove dependency on moment.js

[kennsippell]

Package.json contains both luxon and moment. #118 moves harness to use only Luxon for all datetime manipulation/interfaces, but the dependency on moment.js cannot yet be killed because of core dependency.

Seems like we should do something like this in the build script

ERROR in ./node_modules/cht-core-3-11/webapp/src/js/enketo/translator.js 1:15-32
Module not found: Error: Can't resolve 'moment' in '/home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/src/js/enketo'
resolve 'moment' in '/home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/src/js/enketo'
  Parsed request is a module
  using description file: /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/package.json (relative path: ./src/js/enketo)
    resolve as module
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/src/js/enketo/node_modules doesn't exist or is not a directory
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/src/js/node_modules doesn't exist or is not a directory
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/src/node_modules doesn't exist or is not a directory
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/webapp/node_modules doesn't exist or is not a directory
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/cht-core-3-11/node_modules doesn't exist or is not a directory
      /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/node_modules doesn't exist or is not a directory
      looking for modules in /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules
        single file module
          using description file: /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/package.json (relative path: ./node_modules/moment)
            no extension
              Field 'browser' doesn't contain a valid alias configuration
              /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/moment doesn't exist
            .js
              Field 'browser' doesn't contain a valid alias configuration
              /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/moment.js doesn't exist
            .json
              Field 'browser' doesn't contain a valid alias configuration
              /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/moment.json doesn't exist
            .wasm
              Field 'browser' doesn't contain a valid alias configuration
              /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/moment.wasm doesn't exist
        /home/runner/work/medic-conf-test-harness/medic-conf-test-harness/node_modules/moment doesn't exist
      /home/runner/work/medic-conf-test-harness/node_modules doesn't exist or is not a directory
      /home/runner/work/node_modules doesn't exist or is not a directory
      /home/runner/node_modules doesn't exist or is not a directory
      /home/node_modules doesn't exist or is not a directory
      /node_modules doesn't exist or is not a directory
 @ ./ext/OpenrosaXpathEvaluatorBinding.js 7:17-73
 @ ./node_modules/enketo-core/src/js/Form-model.js 566:38-76
 @ ./node_modules/enketo-core/src/js/Form.js 3:16-41
 @ ./src/form-host/wireup.js 2:19-53
 @ ./src/form-host/index.js 2:19-38