$entityTypeManger is undefined [#3557024]

Problem/Motivation

I'm seeing this error in the logs:

Warning: Undefined property: Drupal\graphql_core_schema\Plugin\GraphQL\DataProducer\Route::$entityTypeManger in Drupal\graphql_core_schema\Plugin\GraphQL\DataProducer\Route

It looks like it was introduced in #3553404: Allow altering schema where constructor property promotion was introduced in the Route data producer and it was not realized that the original attribute had a spelling mistake in it.

Proposed resolution

Let's fix the spelling mistake throughout the entire class.

Issue fork graphql_core_schema-3557024

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3557024-entitytypemanger-is-undefined changes, plain diff MR !44
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