feat: apply obscure_error_if_true consistenlty (#5892)

Description
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Consistently applied `obscure_error_if_true` within
`base_node_grpc_server.rs`

Closes #5857

Motivation and Context
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See #5857

How Has This Been Tested?
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Pass existing tests

What process can a PR reviewer use to test or verify this change?
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Code walk-through

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Breaking Changes
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- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

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