[Keystone] Standard error message for remote execution errors

[bolekk]

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[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

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[github-actions]

AER Report: CI Core ran successfully ✅

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AER Report: Operator UI CI ran successfully ✅

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[github-actions]

Flakeguard Summary

Ran new or updated tests between develop and a1e02be (remove_target_errors).

View Flaky Detector Details | Compare Changes

Found Flaky Tests ❌

Name	Pass Ratio	Panicked?	Timed Out?	Race?	Runs	Successes	Failures	Skips	Package	Package Panicked?	Avg Duration	Code Owners
Test_RemoteExecutableCapability_RandomCapabilityError	0.00%	false	false	false	3	0	3	0	github.com/smartcontractkit/chainlink/v2/core/capabilities/remote/executable	false	30ms	@smartcontractkit/keystone, @smartcontractkit/capabilities-team

Artifacts

For detailed logs of the failed tests, please refer to the artifact failed-test-results-with-logs.json.