[Typescript-eslint] Fix `@typescript-eslint/no-base-to-string`

### What is this about?

Fix all errors with `// eslint-disable-next-line @typescript-eslint/no-base-to-string`
Reference: https://typescript-eslint.io/rules/no-base-to-string/

### Scenario

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### Design

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### Technical Details

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### Threat Modeling Framework

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### Acceptance Criteria

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### Stakeholder review needed before the work gets merged

- [ ] Engineering (needed in most cases)
- [ ] Design
- [ ] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

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Search the repository for every `eslint-disable-next-line @typescript-eslint/no-base-to-string` directive, then read the referenced `no-base-to-string` rule documentation to understand each violation. Run the relevant lint checks to confirm the scope and verify that all such errors are resolved without remaining suppressions.

Written by the indexing model from the issue text.