The endpoint builder in BedrockCountTokensConfig.get_bedrock_count_tokens_endpoint
percent-encodes the model id as a single path segment (d4dd865b1a, path-traversal
hardening). Update the four endpoint-URL assertions in TestBedrockCountTokensEndpoint
to expect `amazon.nova-lite-v1%3A0` instead of the literal `:0`, matching production
behavior already covered by test_count_tokens_endpoint_encodes_model_id.
The /v1/messages/count_tokens endpoint was hardcoding the Bedrock runtime
URL, ignoring api_base and aws_bedrock_runtime_endpoint settings. This
aligns it with invoke/converse handlers by using the existing
get_runtime_endpoint() method for consistent endpoint resolution.
Signed-off-by: stias <seokjun.yang@mycraft.kr>
