[5.5][SymbolGraph] add sourceOrigin field for symbols implementing remote protocol requirements

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rdar://77626724

This PR ports #37351 to the release/5.5 branch.

Change information

• Explanation: Manually-implemented properties or methods that are written to conform to a protocol are not linked to the protocol.
• Scope of Issue: Without this relation tying together the implementation and the protocol, there's no way to mask out properties or methods that only exist for the purpose of that implementation.
• Origination: The original implementation of inherited docs in the symbol graph ([SymbolGraph] Add information about "inherited docs" for synthesized symbols #36863) only accounted for "synthesized" symbols, leaving out concrete properties/methods that were still protocol implementations.
• Risk: Low. This change is isolated to the SymbolGraphGen library, and edge rendering is only used when generating symbol graphs in swift-symbolgraph-extract and in symbol-graph serialization requested by -emit-symbol-graph.
• Automated Testing: A new lit test "SymbolGraph/Relationships/Synthesized/RemoteInheritedDocs.swift" has been added, to exercise this code path. Existing automated tests have passed.

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@swift-ci Please test

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@swift-ci Please build toolchain macOS platform

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macOS Toolchain
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Git Sha - 23c5fb4

Install command
tar -zxf swift-PR-37352-980-osx.tar.gz --directory ~/

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I added some extra checks to the test based on #37351 (comment).

@swift-ci Please test

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Build failed
Swift Test OS X Platform
Git Sha - 20301ee

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@swift-ci Please test macOS platform