[Typescript-eslint] Fix `@typescript-eslint/no-floating-promises` violations

### What is this about?

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

### 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 `// eslint-disable-next-line @typescript-eslint/no-floating-promises` and inspect each suppressed call. Read the `@typescript-eslint/no-floating-promises` rule documentation to determine the required handling, then run the relevant lint checks. Done means all identified violations are addressed without those suppressions remaining.

Written by the indexing model from the issue text.