Fix return type annotation of _parse_trace_id_header in Jaeger propagator

[Eason09053360]

Description

_parse_trace_id_header in the Jaeger propagator is annotated as returning tuple[int] (a tuple of exactly one element), but every return path yields a 3-tuple (trace_id, span_id, flags) and the caller unpacks three values. This misleads type checkers.

This PR fixes the annotation to tuple[int, int, int]. Annotation-only change, no runtime impact.
_extract_baggage — Add complete type annotation

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

• Annotation-only change; existing propagator/opentelemetry-propagator-jaeger tests cover the extraction behavior.

• tox -e typecheck

typecheck: commands[0]> pyright --version
WARNING: there is a new pyright version available (v1.1.405 -> v1.1.411).
Please install the new version or set PYRIGHT_PYTHON_FORCE_VERSION to `latest`

pyright 1.1.405
typecheck: commands[1]> pyright
WARNING: there is a new pyright version available (v1.1.405 -> v1.1.411).
Please install the new version or set PYRIGHT_PYTHON_FORCE_VERSION to `latest`

0 errors, 0 warnings, 0 informations
  typecheck: OK (2.88=setup[0.01]+cmd[0.52,2.35] seconds)
  congratulations :) (2.99 seconds)

Does This PR Require a Contrib Repo Change?

• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated

[xrmx]

Change looks good, any chance you can fix all the typing issue in the package so we can enable typechecking? Your PR already fixes half of them. Add the following and then uv run tox -e typecheck

diff --git a/pyproject.toml b/pyproject.toml
index 51bc40983..302fc593c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -133,7 +133,8 @@ include = [
   "exporter/opentelemetry-exporter-otlp-proto-http",
   "exporter/opentelemetry-exporter-otlp-json-common",
   "exporter/opentelemetry-exporter-otlp-common",
-  "codegen/opentelemetry-codegen-json"
+  "codegen/opentelemetry-codegen-json",
+  "propagator/opentelemetry-propagator-jaeger",
 ]
 
 exclude = [
@@ -154,6 +155,7 @@ exclude = [
   "exporter/opentelemetry-exporter-otlp-json-common/tests",
   "exporter/opentelemetry-exporter-otlp-common/tests",
   "exporter/opentelemetry-exporter-otlp-json-common/benchmarks",
+  "propagator/opentelemetry-propagator-jaeger/tests",
 ]
 
 # When packages are correct typed add them to the strict list