Grouping fails if OpenAI is not accessible

[loewenheim]

Running Sentry in an environment where OpenAI is not accessible causes grouping to fail at

sentry/src/sentry/grouping/strategies/message.py

Line 86 in d7e7de8

normalized = parameterizer.parameterize_all(trimmed, _shoudl_run_experiment)

because it calls

sentry/src/sentry/grouping/parameterization.py

Line 223 in d7e7de8

return tiktoken.get_encoding("cl100k_base")

which requires access to OpenAI.

[loewenheim]

Related: #89026

[afaianswq]

Any chance this will be fixed any time soon?