Fail compile-app-settings if there is no .eslintrc file

[newtewt]

When running medic-conf compile-app-settings we should fail early if there is no .eslintrc file when running actions that require it. Otherwise the user is given the error below and it is not very clear what is needed to correct.

    ERROR in ./tasks.js
    Module Error (from ../medic-conf/node_modules/eslint-loader/dist/cjs.js):
    
    /home/newt/dev/test-medic-conf-dir/tasks.js
      1:1  error  'module' is not defined  no-undef

[garethbowen]

Alternatively investigate if there's a way to provide a default eslint config so the app builder only needs to create it if they want to change the default.

[newtewt]

With the proposed solution from @garethbowen we should also ensure that if a user is trying to apply standard of default configs from cht-core. Eslintrc should respect the default config and not go looking at parent directories for estlintrc files.

[njogz]

Ready for AT on 333-fail-compile-app-settings-if-there-is-no-eslint-file

[meghna-khemka]

Tested above issue and issue seems to be working fine using medic-conf.js
Still need to test using index.js, will retest once index.js is merged to the branch as it seems to be missing from this branch.

[meghna-khemka]

Tested with index.js and issue seems to be working fine.