fix: Correct path to file containing custom fetch function when building Mesh project

[cweckesser]

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Description

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motivation and context. List any dependencies that are required for this change.

Fixes #5840

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update

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How Has This Been Tested?

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reproduce. Please also list any relevant details for your test configuration

• A unit test was added that verifies that when processing Mesh configuration with a custom fetch function and code generation, the generated code contains the correct path to the file implementing the custom fetch function

Test Environment:

• OS:
• @graphql-mesh/...:
• NodeJS:

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 and linter rules pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Further comments

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[changeset-bot]

🦋 Changeset detected

Latest commit: 2c84263

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@graphql-mesh/config	Patch
nextjs-apollo-example	Patch
nextjs-sdk-example	Patch
odata-msgraph-programmatic-ts	Patch
odata-msgraph-programmatic	Patch
postgres-geodb-example	Patch

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[ardatan]

Thanks @cweckesser !