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Livio Spring 35ad7fd9b8 feat(api): move instance service to v2 (#10919)
# Which Problems Are Solved

As part of our efforts to simplify the structure and versions of our
APIs, were moving all existing v2beta endpoints to v2 and deprecate
them. They will be removed in Zitadel V5.

# How the Problems Are Solved

- This PR moves instance v2beta service and its endpoints to a
corresponding v2 version. The v2beta service and endpoints are
deprecated.
- The docs are moved to the new GA service and its endpoints. The v2beta
is not displayed anymore.
- The comments and have been improved and, where not already done, moved
from swagger annotations to proto.
- All required fields have been marked with (google.api.field_behavior)
= REQUIRED and validation rules have been added where missing
- `Domain` has been renamed to `CustomDomain` to align with naming
conventions
- `..Query` has been renamed to `..Filter` to align with other services
- The `instance_id` parameter can now passed on all endpoints and is
properly used, but requires `system` permissions. It can be omitted to
use the own instance (identified by context as any other service).
  - The following endpoints are affected:
    - GetInstance
    - UpdateInstance
    - ListCustomDomains
    - AddTrustedDomain
    - RemoveTrustedDomain
    - ListTrustedDomains
- InstanceService has been added the InstanceInterceptor's
`explicitInstanceIdServices` to allow passing the id
- If the instance is not found by id, the error is not directly returned
to prevent enumeration.
- Permissions are checked in the API instead of the interceptor for
these calls.
- Setting the same instance name in the update no longer returns an
error, but the previous change date.

# Additional Changes

none

# Additional Context

- part of https://github.com/zitadel/zitadel/issues/10772
- requires backport to v4.x

(cherry picked from commit c2a0b9d187)
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