feat: DIA-1716: Google AI Studio (Gemini) support in Prompts

[matt-bernstein]

PR fulfills these requirements

• Commit message(s) and PR title follows the format [fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made ex. fix: DEV-XXXX: Removed inconsistent code usage causing intermittent errors
• Tests for the changes have been added/updated (for bug fixes/features)
• Docs have been added/updated (for bug fixes/features)
• Best efforts were made to ensure docs/code are concise and coherent (checked for spelling/grammatical errors, commented out code, debug logs etc.)
• Self-reviewed and ran all changes on a local instance (for bug fixes/features)

Change has impacts in these area(s)

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• Product design
• Backend (Database)
• Backend (API)
• Frontend

Describe the reason for change

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What does this fix?

(if this is a bug fix)

What is the new behavior?

(if this is a breaking or feature change)

What is the current behavior?

(if this is a breaking or feature change)

What libraries were added/updated?

(list all with version changes)

Does this change affect performance?

(if so describe the impacts positive or negative)

Does this change affect security?

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What alternative approaches were there?

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What feature flags were used to cover this change?

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Does this PR introduce a breaking change?

(check only one)

• Yes, and covered entirely by feature flag(s)
• Yes, and covered partially by feature flag(s)
• No
• Not sure (briefly explain the situation below)

What level of testing was included in the change?

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• e2e
• integration
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Which logical domain(s) does this change affect?

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[codecov]

Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 76.94%. Comparing base (e0e91fd) to head (b990ba4).

Files with missing lines	Patch %	Lines
label_studio/ml_model_providers/models.py	78.26%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6890      +/-   ##
===========================================
- Coverage    76.94%   76.94%   -0.01%     
===========================================
  Files          175      175              
  Lines        14144    14165      +21     
===========================================
+ Hits         10883    10899      +16     
- Misses        3261     3266       +5     

Flag	Coverage Δ
pytests	76.94% <78.26%> (-0.01%)	⬇️

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