Remove virtual type support hint

[temaEmelyan]

Please make sure you consider the following:

• Add tests that use __typename in queries
• Does this change work with all nadel transformations (rename, type rename, hydration, etc)? Add tests for this.
• Is it worth using hints for this change in order to be able to enable a percentage rollout?
• Do we need to add integration tests for this change in the graphql gateway?
• Do we need a pollinator check for this?

[github-actions]

Test Results

  661 files  +  661    661 suites  +661   1m 11s ⏱️ + 1m 11s
2 223 tests +2 223  1 661 ✅ +1 661  562 💤 +562  0 ❌ ±0 
2 231 runs  +2 231  1 669 ✅ +1 669  562 💤 +562  0 ❌ ±0 

Results for commit c32fbed. ± Comparison against base commit 58c419e.