build: Use conventionalcommits template instead of Angular (#2054)

- This template sorts Breaking Changes, Features, Fixes, and then
everything else which is what we want
- Sort order defined by the config. See
[constants.js](https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-changelog-conventionalcommits/src/constants.js)
and
[commitGroupOrder](https://github.com/conventional-changelog/conventional-changelog/blob/d3b8aaa16337993bbad4d91db1ffac5a7568756b/packages/conventional-changelog-conventionalcommits/src/writer.js#L70C9-L70C25)
- It also puts Breaking Changes first (which are just notes) [in the
template](https://github.com/conventional-changelog/conventional-changelog/blob/d3b8aaa16337993bbad4d91db1ffac5a7568756b/packages/conventional-changelog-conventionalcommits/src/templates/template.hbs#L5).
- See an example of how [v0.78.0 release notes would look with this
template](https://github.com/mofojed/web-client-ui/blob/1921-changelog-updates-3/CHANGELOG.md#0780-2024-06-03)
compared to the [previously generated release notes for
v0.78.0](https://github.com/deephaven/web-client-ui/releases/tag/v0.78.0).
- Fixes #1921

lerna.json

@@ -4,6 +4,9 @@
   "command": {
     "publish": {
       "distTag": "latest"
+    },
+    "version": {
+      "changelogPreset": "conventionalcommits"
     }
   }
 }

package.json

@@ -106,6 +106,7 @@
     "@vitejs/plugin-react-swc": "^3.3.0",
     "@vscode/codicons": "0.0.36",
     "chokidar-cli": "^2.1.0",
+    "conventional-changelog-conventionalcommits": "^7.0.0",
     "cross-env": "^7.0.2",
     "eslint": "^8.29.0",
     "identity-obj-proxy": "^3.0.0",