Replace OperationStore import with OperationResultStore from urql

[McEazy2700]

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Description

Updated @graphql-codegen/urql-svelte-operations-store to import OperationResultStore in place of OperationStore from @urql/svelte

Related # (issue)
'"@urql/svelte"' has no exported member named 'OperationStore'. Did you mean 'OperationType'?

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update

How Has This Been Tested?

• pnpm build

Test Environment:

• OS: Linux
• @graphql-codegen/...: 5.0.3
• NodeJS: 20.11.1

Checklist:

• I have followed the
  CONTRIBUTING doc and the
  style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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Latest commit: ae9a68b

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