Fix document registry creating duplicate buckets for projects with different pathsBasePath

[ekazakov14]

Fixes SourceFile cache reuse between projects.

I couldn't find an existing issue related to this. I don't expect this to be merged given the current state of the repo, but I'm publishing the change for visibility since I'll be applying it as a local patch in our projects.

Problem

monorepo/
├── packages/projectA/tsconfig.json   (pathsBasePath = "/monorepo/packages/projectA")
├── packages/projectB/tsconfig.json   (pathsBasePath = "/monorepo/packages/projectB")
└── shared/utils.d.ts                 (used by both projects)

Both projects have identical compiler options, only pathsBasePath differs.

┌─ Document Registry (before fix) ──────────────────────────────────────────┐
│                                                                           │
│  Bucket key: "...options...|/monorepo/packages/projectA"                  │
│    └─ shared/utils.d.ts  →  SourceFile instance A                        │
│                                                                           │
│  Bucket key: "...options...|/monorepo/packages/projectB"                  │
│    └─ shared/utils.d.ts  →  SourceFile instance B  ← duplicate!          │
│                                                                           │
└───────────────────────────────────────────────────────────────────────────┘

┌─ Document Registry (after fix) ───────────────────────────────────────────┐
│                                                                           │
│  Bucket key: "...options..."                                              │
│    └─ shared/utils.d.ts  →  SourceFile instance A  ← shared by both      │
│                                                                           │
└───────────────────────────────────────────────────────────────────────────┘

Summary

When multiple projects in a monorepo share the same compiler options but reside in different directories, the document registry creates separate buckets for each project due to pathsBasePath being included in the bucket key. This causes duplicate SourceFile instances for shared files, increasing memory consumption.

The pathsBasePath property is derived from the paths compiler option, which itself is not marked as affectsSourceFile. Therefore pathsBasePath should not participate in the document registry bucket key either.

Changes

Move pathsBasePath from the shared getKeyForCompilerOptions into getRedirectsCacheKey, so it only affects the module resolution cache where it is actually needed.

Impact

In large monorepos with many projects sharing the same compiler options, this reduces memory usage by allowing the document registry to reuse SourceFile instances across projects instead of creating duplicates per pathsBasePath. It also slightly speeds up initialization of new projects (processRootFiles) since cached SourceFile instances are reused instead of being re-parsed.

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