tests.system.vertexai.test_tokenization.TestTokenization: many tests failed

Many tests failed at the same time in this package.

* I will close this issue when there are no more failures in this package _and_
there is at least one pass.
* No new issues will be filed for this package until this issue is closed.
* If there are already issues for individual test cases, I will close them when
the corresponding test passes. You can close them earlier, if you prefer, and
I won't reopen them while this issue is still open.

Here are the tests that failed:
* test_count_tokens_local[_get_tokenizer_for_model_preview-gemini-1.5-pro-002-udhr-udhr-PROD_ENDPOINT]
* test_count_tokens_local[get_tokenizer_for_model-gemini-1.5-pro-002-udhr-udhr-PROD_ENDPOINT]
* test_compute_tokens[_get_tokenizer_for_model_preview-gemini-1.5-pro-002-udhr-udhr-PROD_ENDPOINT]
* test_compute_tokens[get_tokenizer_for_model-gemini-1.5-pro-002-udhr-udhr-PROD_ENDPOINT]
* test_count_tokens_system_instruction[gemini-1.5-pro-002-PROD_ENDPOINT]
* test_count_tokens_system_instruction_is_function_call[gemini-1.5-pro-002-PROD_ENDPOINT]
* test_count_tokens_system_instruction_is_function_response[gemini-1.5-pro-002-PROD_ENDPOINT]
* test_count_tokens_tool_is_function_declaration[gemini-1.5-pro-002-PROD_ENDPOINT]
* test_count_tokens_content_is_function_call[gemini-1.5-pro-002-PROD_ENDPOINT]
* test_count_tokens_content_is_function_response[gemini-1.5-pro-002-PROD_ENDPOINT]

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commit: ca6b45e3fa09bfa53c2f2c1b1d44f9a3c7aa79d7
buildURL: [Build Status](https://source.cloud.google.com/results/invocations/f6fde6a0-bd74-4ea9-b7b7-c2c539a82eab), [Sponge](http://sponge2/f6fde6a0-bd74-4ea9-b7b7-c2c539a82eab)
status: failed

Start by running tests.system.vertexai.test_tokenization.TestTokenization and inspect the listed failures for gemini-1.5-pro-002 against PROD_ENDPOINT. Trace the tokenization behavior for local counts, computed tokens, system instructions, tools, and function calls or responses. Done means the package has no remaining failures and at least one test passes.

Written by the indexing model from the issue text.