[DevTask] Revisit ESLint rules after TS strict mode enabled

Disabled rules in ESLint config should be reviewed after strict mode has been enabled.

e.g. re-enable:
```
"@typescript-eslint/no-unnecessary-type-assertion": "off",
```

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-4730-DevTask-Revisit-ESLint-rules-after-TS-strict-mode-enabled-2476d73d3650812f8727e126c3710ff9) by [Unito](https://www.unito.io)

Start by locating the ESLint configuration and identifying rules disabled after TypeScript strict mode was enabled. Review the example rule, @typescript-eslint/no-unnecessary-type-assertion, along with the other disabled rules, then use the existing lint check to verify which can be enabled without violations. Done means the relevant rules are re-enabled and lint passes.

Written by the indexing model from the issue text.