Improve frontend type-safety

[brojd]

Currently the significant part of the frontend codebase is opted-out from TypeScript core features. It's done by using both implicit and explicit any, @ts-ignore, strict: false, lack of HTTP request/response typings or using less strict types while higher specificity is possible (e.g. using type string when only values a and b are possible).

There are several steps that can be performed to make the code more type-safe. That will enable us to reduce nb of bugs related to incorrect typings of data that is coming from the backend / incorrect payloads passed in requests as well as catch possible issues quicker (during development instead of after deployment), improve developer experience (intellisense) and improve readability.

The initiative includes the following issues:

Issues in both groups are sorted by the order they should be picked up. It is possible to work on both groups in parallel with just one exception - it would be great to have #3330 from Group A before starting to work on Group B

Backend

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1. Improve coverage of OpenAPI schemas #3444
   part:Terraform/Crossplane +1
   
2. https://github.com/grafana/oncall-private/issues/2456
3. https://github.com/grafana/oncall-private/issues/2457

Frontend

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1. Improve type-safety: manually generate TS types based OpenAPI schema #3330
   involved:Frontend +1
   
2. Improve type-safety: use autogenerated types across frontend codebase (part 1) #3331
   involved:Frontend +1
   
3. Improve type-safety: automate generation of API-related TypeScript types #3332
   involved:Frontend needs triage +2
4. Improve type-safety: forbid implicit any #3329
   involved:Frontend needs triage +2
5. Improve type-safety: forbid explicit any #3333
   involved:Frontend needs triage +2
6. Improve type-safety: forbid @ts-ignore #3334
   involved:Frontend needs triage +2
7. Improve type-safety: change TS strict mode #3335
   involved:Frontend needs triage +2

Tasks

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