fix: Conversation scrolling stops loading following messages

[przemvs]

https://wearezeta.atlassian.net/browse/WPB-9465

Description

Probably something was wrong while refactoring. Previously we not checking all messages, probably this if checking will fix this issue.

Previously code:

readonly loadFollowingMessages = () => {
    const lastMessage = this.conversation().getLastMessage();

    if (lastMessage) {
      if (!this.isLastReceivedMessage(lastMessage, this.conversation())) {
        // if the last loaded message is not the last of the conversation, we load the subsequent messages
        this.conversationRepository.getSubsequentMessages(this.conversation(), lastMessage as ContentMessage);
      }
    }
  };

Screenshots/Screencast (for UI changes)

Checklist

• [ ] PR has been self reviewed by the author;
• [ ] Hard-to-understand areas of the code have been commented;
• [ ] If it is a core feature, unit tests have been added;

Important details for the reviewers

(Delete this section if unnecessary)

• use (x) data
• can be reviewed commit-by-commit
• be sure to look at ...

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 46.14%. Comparing base (ec97ed0) to head (fef640c). Report is 2 commits behind head on dev.

:exclamation: Current head fef640c differs from pull request most recent head 6455a43

Please upload reports for the commit 6455a43 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #17627 +/- ## ========================================== - Coverage 46.15% 46.14% -0.02% ========================================== Files 760 760 Lines 24993 24992 -1 Branches 5721 5720 -1 ========================================== - Hits 11535 11532 -3 - Misses 12015 12017 +2 Partials 1443 1443 ```

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud