Add changeset

Author: sachindshinde

.changesets/fix_sachin_fix_shareable_mutation_fields_in_qp.md

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+### Error when query planning a satisfiable @shareable mutation field ([PR #8352](https://github.com/apollographql/router/pull/8352))
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+When query planning a mutation operation that executes a @shareable mutation field at top-level, query planning may unexpectedly error due to attempting to generate a plan where that mutation field is called more than once across multiple subgraphs. Query planning has now been updated to avoid generating such plans.
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+By [@sachindshinde](https://github.com/sachindshinde) in https://github.com/apollographql/router/pull/8352