Use text-bison model for auto-generated review summaries
What does this MR do and why?
We don't need to use chat-bison
model for this and to be
consistent with summarize pending comments AI feature which uses
text-bison
model, we use text-bison
for the auto-generated
review summaries feature.
Related Issue
https://gitlab.com/internal-handbook/internal-handbook.gitlab.io/-/issues/75#note_1594624405
MR acceptance checklist
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