docs: adds httpErrorHandled example and integration test for HttpError

[karel-rehor]

Proposed Changes

• Add an example of using recently added HttpError type
• Add an extra integration test working with this type

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] A test has been added if appropriate
• [x] yarn test completes successfully
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (8cfa06c) to head (5a1f2de). Report is 3 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1020 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 35 35 Lines 1449 1449 Branches 344 344 ========================================= Hits 1449 1449 ```

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