Avoid Adding All Possible Federated Directives to SDL String in GraphQL Subgraph

[MohamedSabthar]

Description:
The Current Implementation of Subgraph Includes All the Federated Directives Listed Here: https://www.apollographql.com/docs/federation/subgraph-spec.

Since the current implementation only supports the @key directive, we should only add this directive to the auto-generated SDL string.

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[ThisaruGuruge]

Closing as this has to be confirmed from the Apollo federation spec. @DimuthuMadushan let's link the issue here.

[github-actions]

This issue is NOT closed with a proper Reason/ label. Make sure to add proper reason label before closing. Please add or leave a comment with the proper reason label now.

      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
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      - Reason/Complex - Issue occurred due to complex scenario.
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[DimuthuMadushan]

issue: apollographql/apollo-federation-subgraph-compatibility#475

[DimuthuMadushan]

Re-open the issue due to this apollographql/apollo-federation-subgraph-compatibility#475 (comment)