UIAPPS-78 Fix format, lint, and test scripts

This at least should get CI passing again.

There are a couple parts to this. First, the `examples/sentiment`
package didn't have either a `format` or `lint` script. We add a
`format` script (but don't run it), and a `lint` script that exits with
0. The code style in the `examples/sentiment` package doesn't match up
with the rest of this repo, so it will have to be fixed before we add
an actual `lint` script that does something useful.

Another part of this is that the `lint` script for
`packages/ui-extensions-sdk` broke after pulling in the code from the
`apps` repo. It's unclear why, but `eslint-plugin-prettier` seems to
have some issue with being in a monorepo when run under yarn v1 and not
at the top-level:
prettier/eslint-plugin-prettier#396. While we
could upgrade to yarn v3, we hold off on making that change at the
moment.

Finally, we add a few ignore files so the format/lint scripts are useful
in development (where there might be artifacts in the respective
directories).

examples/sentiment/.eslintignore

@@ -0,0 +1 @@
+build

examples/sentiment/.prettierignore

@@ -0,0 +1 @@
+build

examples/sentiment/package.json

@@ -13,7 +13,9 @@
  "scripts": {
  "start": "react-scripts start",
  "build": "react-scripts build",
- "test": "react-scripts test",
+ "format": "prettier --write .",
+ "lint": "echo TODO: Add lint script",
+ "test": "react-scripts test --passWithNoTests --watchAll=false",
  "eject": "react-scripts eject"
  },
  "eslintConfig": {

package.json

@@ -17,5 +17,8 @@
  "workspaces": [
  "examples/*",
  "packages/*"
- ]
+ ],
+ "devDependencies": {
+ "eslint-plugin-prettier": "3.1.4"
+ }
 }

packages/ui-extensions-sdk/.eslintignore

@@ -0,0 +1 @@
+dist

packages/ui-extensions-sdk/.prettierignore

@@ -0,0 +1 @@
+dist

packages/ui-extensions-sdk/package.json

@@ -46,7 +46,6 @@
  "eslint-plugin-import": "2.22.1",
  "eslint-plugin-jest": "24.1.0",
  "eslint-plugin-no-storage": "1.0.2",
- "eslint-plugin-prettier": "3.1.4",
  "express": "^4.17.1",
  "jest": "^26.6.2",
  "prettier": "2.1.2",