Handle Hex String in Utils.ToDecimal

[cawthorne]

#DF-20580 The EA Telemetry currently fails for EAs where their result is a hex string: https://smartcontract-it.atlassian.net/browse/DF-20580

https://chainlink-core.slack.com/archives/C0117GGJB6Y/p1729091653229629

This is a second implementation I am experimenting with/proposing, original PR is here: https://github.com/smartcontractkit/chainlink/pull/14827

[github-actions[bot]]

AER Report: CI Core ran successfully :white_check_mark:

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AER Report: Operator UI CI ran successfully :white_check_mark:

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[cl-sonarqube-production[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

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