Port tests for go to implementation and diff definitions tests

[gabritto]

In this PR:

• Port of baseline go to implementation fourslash tests.
• Baseline diffing for go to definition, go to type definition, and go to implementation.
• Include lib files in baselines (+ fix to embed's walkDir)
• Re-add support for printing context spans (i.e. LocationLink's target range) in baselines.

Note: I also added a method to fourslash tests in Corsa to mark them as originally server tests, because due to a bug in the fourslash server test harness, we don't include context spans in server tests, so I added the same special behavior (which we can remove later) to make diffing easier.

[Copilot]

Pull Request Overview

This PR ports baseline tests for "go to implementation" from the TypeScript fourslash test suite and adds baseline diffing support for go to definition, go to type definition, and go to implementation operations. Key changes include:

• Porting baseline go to implementation fourslash tests
• Adding baseline diffing for navigation features (go to definition, go to type definition, go to implementation)
• Including lib files in baselines with a fix to embed's walkDir
• Re-adding support for printing context spans (LocationLink's target range) in baselines
• Adding a method to mark fourslash tests as originally server tests to handle differences in context span behavior

Reviewed Changes

Copilot reviewed 300 out of 687 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/ls/findallreferences.go	Simplified context range calculation by using entry.context directly instead of computing contextNode
testdata/baselines/reference/submodule/fourslash/findRenameLocations/*.baseline.jsonc	Updated baseline files with corrected line numbers for skipped lines
testdata/baselines/reference/fourslash/goToType/*.baseline.jsonc	Removed baseline files (likely moved or consolidated)
testdata/baselines/reference/fourslash/goToDefinition/reallyLargeFile.baseline.jsonc	Removed baseline file
testdata/baselines/reference/fourslash/findAllReferences/*.baseline.jsonc	Updated baseline files with corrected line numbers for skipped lines
testdata/baselines/reference/fourslash/documentHighlights/*.baseline.jsonc	Updated baseline files with corrected line numbers for skipped lines
internal/fourslash/tests/gen/*_test.go	Added MarkTestAsStradaServer() calls to various test files to mark them as originally server tests