Fixed UTF8 character encoding issue when retrieving persisted payloads

[matux]

Description of the change

This PR fixes a character encoding issue when retrieving persisted payloads where strings weren't being read as UTF8 resulting in garbled strings.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Related issues

• SC-127180
• Fixes String Encoding Error for ’ (forward tick character) (3.0.0) #294
• Fixes Emojis are not rendering correctly in the Dashboard/items #295

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[shortcut-integration]

This pull request has been linked to Shortcut Story #127180: Character encoding works differently compared to rollbar-ios SDK.