codegen: resolve language chooser markup in generated SDKs

[pose]

Context

Consumer half of pulumi/pulumi#16099, under epic pulumi/home#4787. pulumi-java's gen-sdk codegen leaks language chooser markup into generated SDKs: description routes through codegen.FilterExamples (which only filters fenced code examples, not the chooser), and deprecationMessage is emitted via formatForeignBlockComment/printObsoleteAttribute (pkg/codegen/java/gen.go) with no resolution at all.

Acceptance criteria

• Generated Java SDK description and deprecation strings contain no <span pulumi-lang-*> inflection markup nor <!--Start PulumiCodeChooser -->…<!--End PulumiCodeChooser --> blocks; the language-appropriate token/example is rendered.
• Resolution is applied to both description and deprecationMessage, at every level (package, resource, function, type, property, enum value).
• Covered by a codegen test using a schema that carries chooser markup (e.g. a renamed/deprecated field).

Prior art: pulumi-terraform-bridge/pkg/tfgen/schemafilter.FilterSchemaByLanguage (field-agnostic, handles both markup forms). (Correction: gen-sdk does not resolve this for any SDK language — dotnet only XML-escapes it in doc comments; tracked for dotnet at pulumi/pulumi-dotnet#1023 and for go/nodejs/python at pulumi/pulumi#16099.)

Part of pulumi/home#4787.