[Go SDK] Rewrite dot runner to generate DOT from portable pipeline proto

[YousufFFFF]

Fixes #27508

This change rewrites the Go SDK dot runner to generate the DOT graph
from the portable pipeline proto representation instead of relying on
Go SDK internal graph structures.

By basing DOT generation on the portable pipeline model:

• Cross-language pipelines can now be rendered correctly.
• The implementation aligns with the portable runner architecture.
• It enables future reuse in Prism Runner and other portable tooling.

The change preserves existing behavior while switching the graph
source to the portable proto.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the Go SDK's DOT graph generation mechanism. Instead of relying on internal Go SDK graph structures, the system now processes the portable pipeline protocol buffer representation to create DOT graphs. This fundamental shift enhances compatibility with cross-language pipelines and aligns the Go SDK with the broader portable runner architecture, paving the way for more integrated and reusable tooling.

Highlights

• Portable Pipeline Proto Integration: The Go SDK dot runner has been rewritten to generate DOT graphs directly from the portable pipeline protocol buffer representation.
• Cross-Language Compatibility: This change enables the correct rendering of cross-language pipelines in DOT format.
• Architectural Alignment: The implementation now aligns with the portable runner architecture, improving consistency and maintainability.
• Future Reusability: The new approach facilitates future reuse in tools like Prism Runner and other portable tooling.

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Changelog

• sdks/go/pkg/beam/runners/dot/dot.go
  • Replaced the dotlib import with graphx and added the fmt package.
  • Modified the Execute function to marshal pipeline edges into a portable protocol buffer representation using graphx.Marshal.
  • Implemented custom DOT graph generation logic by iterating over portable pipeline components and transforms.
  • Removed the previous reliance on dotlib.Render for DOT graph creation.
  • Added logic to build consumer relationships between PCollections and transforms, correctly handling and skipping composite transforms for accurate graph representation.

Activity

• No specific activity (comments, reviews, or progress updates) was provided in the context.

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[YousufFFFF]

Hi @mohamedawnallah!
CI checks are green and the implementation is complete.
Would appreciate your review when you have time.
Thanks!

[github-actions]

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R: @shunping for label go.

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