fix(analyzer): support member access on Annotated alias values

[Henry Su (hsusul)]

Closes #11538.

Summary of Changes

At runtime, typing._AnnotatedAlias.__getattr__ delegates attribute access to __origin__ (the underlying annotated type).

In getTypeOfMemberAccessWithBaseType:

• Preserved baseType.props?.typeForm as baseTypeForm before stripping special forms.
• When member lookup on an Annotated special form produces an error or no member, falls back to evaluating member access against the underlying typeForm.
• Added sample test annotated10.py and test suite entry in typeEvaluator7.test.ts verifying member access on an Annotated alias value.

[Bill Schnurr (bschnurr)]

🔒 Automated review in progress — Bill Schnurr (@bschnurr) is auto-reviewing this PR.

[Bill Schnurr (bschnurr)]

Verification: The relevant tests could not be fully run in the isolated environment; this review is not fully verified.

Result: could-not-verify

Summary: No tests executed because the verification container could not start: no trusted sandbox image is configured for `microsoft/pyright`. The PR adds the targeted `Annotated10` Jest case covering member access through an `Annotated` alias. Verification is therefore blocked by the environment.

Test runs: 2 not run

• ⚠️ Not run | Dependency and test discovery | git status --short && git diff --name-status upstream/main...HEAD && git diff --stat upstream/main...HEAD && if [ -d packages/pyright-internal/node_modules ]; then echo DEPS_PRESENT; else echo DEPS_MISSING; fi && node -e "const p=require('./packages/pyright-internal/package.json'); console.log(JSON.stringify(p.scripts))"
• ⚠️ Not run | Annotated10 | node ./node_modules/jest/bin/jest.js typeEvaluator7.test -t Annotated10 --runInBand

⚠️ Dependency and test discovery diagnostic output

Container verification could not start: no trusted sandbox image is configured for microsoft/pyright.

⚠️ Annotated10 diagnostic output

Not attempted after the verification container failed to start.

[Bill Schnurr (bschnurr)]

Approved via Review Center.