Business Dashboard: should not load all comments until they're needed

#### Description

The Business Dashboard loads all filing comments when it initializes, even though the comments are not needed until a filing (ledger item) is expanded/opened. This slows the app's initialization and causes a lot of network traffic (and calls that the API has to respond to) unnecessarily.

#### Steps to reproduce

1. login with BCREG0020
2. open DevTools
3. go to https://dev.business-dashboard.bcregistry.gov.bc.ca/BC0885606?accountid=668
4. observe in Network tab that the detail comments for all filings are being fetched -- they should only be fetched when the filing is expanded (same as documents)

#### Impact

Slower UI initialization and a ton of network traffic and extra API load that is not needed. The comments should be fetched when a filing (ledger item) is expanded/opened.

The additional delay, for the sample business noted above, is only 1-2 seconds (for about 20 comments). (If a business had more ledger items with comments, it would be more delay.)