Validate non-file manifest fields with file data sources

[DeepCogNeural]

Fixes #2045

Summary

• keep manifest schema validation active for regular data sources/templates when file data sources are present
• omit only file data sources/templates from the schema-validation copy until file data source validation is implemented
• add a regression fixture where a file/ipfs template no longer hides a numeric network value in a regular Ethereum data source

Tests

• npx pnpm@9.15.9 --filter @graphprotocol/graph-cli exec vitest run tests/cli/validation.test.ts -t "File data source does not skip regular manifest validation" -u
• npx pnpm@9.15.9 --filter @graphprotocol/graph-cli test:validation
• npx pnpm@9.15.9 --filter @graphprotocol/graph-cli build
• ../../packages/cli/bin/run.js codegen --skip-migrations in examples/matic-lens-protocol-posts-subgraph
• npx pnpm@9.15.9 exec prettier --check packages/cli/src/subgraph.ts packages/cli/tests/cli/validation.test.ts packages/cli/tests/cli/validation/file-data-source-invalid-manifest/subgraph.yaml packages/cli/tests/cli/validation/file-data-source-invalid-manifest/schema.graphql packages/cli/tests/cli/validation/file-data-source-invalid-manifest/Abi.json
• git diff --check

Note: npx pnpm@9.15.9 --filter @graphprotocol/graph-cli type-check currently fails on existing generated imports under tests/cli/add/subgraph/src/mapping.ts; this PR does not touch that fixture.

[changeset-bot]

🦋 Changeset detected

Latest commit: f231e1c

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

This PR includes changesets to release 1 package

Name	Type
@graphprotocol/graph-cli	Patch

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