Refactor: Rename encodeBitmapToBase64Png to encodeBitmapToBase64Jpeg

[rlazo]

The private function encodeBitmapToBase64Png in firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/Part.kt was already compressing Bitmap images to JPEG format, not PNG.

This commit renames the function to encodeBitmapToBase64Jpeg to accurately reflect its behavior. The single call site within the same file has also been updated.

no-changelog

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📝 PRs merging into main branch

Our main branch should always be in a releasable state. If you are working on a larger change, or if you don't want this change to see the light of the day just yet, consider using a feature branch first, and only merge into the main branch when the code complete and ready to be released.

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Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_responses.sh should be updated to clone the latest version of the responses: v10.0

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	1 Warning
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Coverage Report ¹

Affected Products

No changes between base commit (534cc53) and merge commit (9915e09).

Test Logs

• Base (534cc53): https://github.com/firebase/firebase-android-sdk/actions/runs/14599808285
• Merge (9915e09): https://github.com/firebase/firebase-android-sdk/actions/runs/14625920274

1. https://storage.googleapis.com/firebase-sdk-metric-reports/B19nv35lWK.html

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Test Results

 18 files   -  48   18 suites   - 48   14s ⏱️ - 1m 5s
 86 tests  - 466   86 ✅  - 465  0 💤  - 1  0 ❌ ±0 
172 runs   - 932  172 ✅  - 930  0 💤  - 2  0 ❌ ±0 

Results for commit c438b82. ± Comparison against base commit 534cc53.

This pull request removes 552 and adds 86 tests. Note that renamed tests count towards both.

com.google.firebase.dataconnect.AnyValueSerializerUnitTest ‑ descriptor should have expected values
com.google.firebase.dataconnect.AnyValueSerializerUnitTest ‑ deserialize() should throw UnsupportedOperationException
com.google.firebase.dataconnect.AnyValueSerializerUnitTest ‑ serialize() should throw UnsupportedOperationException
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(Boolean) creates an object with the expected value
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(Double) creates an object with the expected value (edge cases)
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(Double) creates an object with the expected value (normal cases)
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(List) creates an object with the expected value (edge cases)
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(List) creates an object with the expected value (normal cases)
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(Map) creates an object with the expected value (edge cases)
com.google.firebase.dataconnect.AnyValueUnitTest ‑ constructor(Map) creates an object with the expected value (normal cases)
…

com.google.firebase.vertexai.GenerativeModelTesting ‑ exception thrown when using invalid location
com.google.firebase.vertexai.GenerativeModelTesting ‑ system calling in request
com.google.firebase.vertexai.SchemaTests ‑ basic schema declaration
com.google.firebase.vertexai.SchemaTests ‑ full schema declaration
com.google.firebase.vertexai.SerializationTests ‑ test Candidate serialization as Json
com.google.firebase.vertexai.SerializationTests ‑ test GenerateContentResponse serialization as Json
com.google.firebase.vertexai.SerializationTests ‑ test Schema serialization as Json
com.google.firebase.vertexai.SerializationTests ‑ test countTokensResponse serialization as Json
com.google.firebase.vertexai.SerializationTests ‑ test modalityTokenCount serialization as Json
com.google.firebase.vertexai.VertexAIStreamingSnapshotTests ‑ citation parsed correctly
…