Mark requests stubs as complete (#8858)

Co-authored-by: Kevin Kirsche <kevin.kirsche@one.verizon.com>

stubs/requests/@tests/stubtest_allowlist.txt

@@ -1,6 +1,40 @@
+# Re-exports from urllib3 (should be fixed in those stubs, not here)
+requests.adapters.HTTPResponse.DECODER_ERROR_CLASSES
+requests.adapters.PoolManager.connection_from_context
 requests.adapters.PoolManager.connection_from_host
+requests.adapters.PoolManager.connection_from_pool_key
 requests.adapters.PoolManager.connection_from_url
+requests.adapters.PoolManager.proxy_config
 requests.adapters.PoolManager.urlopen
-requests.sessions.SessionRedirectMixin.resolve_redirects
-requests.structures.LookupDict.__getattr__
-requests.structures.LookupDict.get
+requests.adapters.Retry.DEFAULT
+
+# Unnecessary re-exported constants from requests.compat
+requests.adapters.basestring
+requests.auth.basestring
+requests.utils.basestring
+requests.utils.integer_types
+requests.models.basestring
+
+# Unnecessary re-exported constant
+# (you should access this as `requests.__version__` or `requests.__version__.__version__`,
+# not `requests.help.requests_version`)
+requests.help.requests_version
+
+# No reason to access this re-exported constant from `requests.sessions` instead of from `requests.utils`
+requests.sessions.DEFAULT_PORTS
+
+# Unnecessary re-exports of third-party modules
+requests.help.chardet
+requests.help.cryptography
+requests.help.pyopenssl
+requests.help.OpenSSL
+
+# Loop variables that leak into the global scope
+requests.packages.mod
+requests.packages.package
+requests.packages.target
+
+# Internal implementation details, not for public consumption
+requests.charset_normalizer_version
+requests.chardet_version
+requests.utils.HEADER_VALIDATORS