Add conditionalNames to webpack in address-search

[gina-yamada]

🎫 Ticket

For tickets LG-10330 and LG-10785, new versions of @18f/identity-address-search were trying to be published on npm but build errors occurred. The solution is to update the webpack.config file for address-search so that dependencies can be resolved.

🛠 Summary of changes

Added conditionNames: ['source'] to the resolve object inside app/javascript/packages/address-search/webpack.config.cjs.

Before this was added, yarn run webpack would cause errors when ran inside app/javascript/packages/address-search
because webpack didn’t know how to resolve a dependency when that dependency is itself. The conditionNames tells webpack to resolve its dependencies (one of which is itself!) using the source export. (Explanation & code change taken from Matt in this thread. I am implementing this to get unblocked.)

📜 Testing Plan

• Step 1 On a branch other than this one, move into app/javascript/packages/address-search and run yarn run webpack. Observer errors. You can also try to publish to npm, you likely won't be successful.
• Step 2 On this branch, app/javascript/packages/address-search and run yarn run webpack. Observer no errors with the build

[sheldon-b]

LGTM. This matches the config used in @18f/identity-components and testing it locally I was able to build the package successfully (which I wasn't able to do before this change)

[gina-yamada]

@sheldon-b Thanks for your thoughts on version. I was updating my comment as you were writing yours. I arrived at the same conclusion.