KG-216 Remove Gemini Flash and Pro 1.5

[aozherelyeva]

Fixes https://youtrack.jetbrains.com/issue/KG-216/Remove-Gemini-Flash-and-Pro-1.5

https://cloud.google.com/vertex-ai/generative-ai/docs/learn/model-versions#legacy-stable
Both will be retired on the 24.09.2025

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Type of the change

• New feature
• Bug fix
• Documentation fix
• Tests improvement
• Refactoring

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• The pull request has a description of the proposed change
• I read the Contributing Guidelines before opening the pull request
• The pull request uses develop as the base branch
• Tests for the changes have been added
• All new and existing tests passed

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• An issue describing the proposed change exists
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[github-actions]

Qodana for JVM

419 new problems were found

Inspection name	Severity	Problems
Check Kotlin and Java source code coverage	🔶 Warning	414
Vulnerable imported dependency	🔶 Warning	4
String concatenation that can be converted to string template	◽️ Notice	1

@@ Code coverage @@
+ 67% total lines covered
9101 lines analyzed, 6104 lines covered
# Calculated according to the filters of your coverage tool

☁️ View the detailed Qodana report

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