Make VertexAIError error codes use the vertex type prefix

[dlarocque]

Since the code argument being passed (e.g. fetch-error) was readonly, it was overriding the prefixed error code that is set in the super constructor (vertexAI/fetch-error). So the error code users would see would not be prefixed. We should include the prefix, since that's what the other products do. Instead of fixing this by just making code not readonly, we should just add the prefix directly to the enum value, so that users can check error codes more safely. Otherwise they'd have access to the non-prefixed errors, and would have to prefix it themselves if they want to actually use it- if (err.code === 'vertexAI/${VertexAIErrorCode.FETCH_ERROR}') {...}

For example:

try {
  // ...
} catch (err) {
  if (err instanceof VertexAIError) {
    if (err.code === VertexAIErrorCode.FETCH_ERROR) { /* ... */ }
  }
}

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Latest commit: ae29787

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[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/vertexai-preview

  Type	Base (beaa4df)	Merge (a4089c2)	Diff
  browser	25.4 kB	25.5 kB	+110 B (+0.4%)
  main	26.0 kB	26.2 kB	+110 B (+0.4%)
  module	25.4 kB	25.5 kB	+110 B (+0.4%)

• firebase

  Type	Base (beaa4df)	Merge (a4089c2)	Diff
  firebase-vertexai-preview.js	19.6 kB	19.7 kB	+162 B (+0.8%)

Test Logs

• Base (beaa4df): https://github.com/firebase/firebase-js-sdk/actions/runs/11010045895
• Merge (a4089c2): https://github.com/firebase/firebase-js-sdk/actions/runs/11077205242

1. https://storage.googleapis.com/firebase-sdk-metric-reports/C8ZDoHzyS1.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

• @firebase/vertexai-preview

  • ChatSession

    Size

    Type	Base (beaa4df)	Merge (a4089c2)	Diff
    size	14.1 kB	14.2 kB	+123 B (+0.9%)
    size-with-ext-deps	32.6 kB	32.8 kB	+122 B (+0.4%)

  • GenerativeModel

    Size

    Type	Base (beaa4df)	Merge (a4089c2)	Diff
    size	16.6 kB	16.7 kB	+141 B (+0.8%)
    size-with-ext-deps	35.1 kB	35.3 kB	+140 B (+0.4%)

  • VertexAIError

    Size

    Type	Base (beaa4df)	Merge (a4089c2)	Diff
    size	3.27 kB	3.24 kB	-30 B (-0.9%)
    size-with-ext-deps	21.1 kB	21.0 kB	-31 B (-0.1%)

  • getGenerativeModel

    Size

    Type	Base (beaa4df)	Merge (a4089c2)	Diff
    size	16.8 kB	16.9 kB	+150 B (+0.9%)
    size-with-ext-deps	35.3 kB	35.5 kB	+149 B (+0.4%)

Test Logs

• Base (beaa4df): https://github.com/firebase/firebase-js-sdk/actions/runs/11010045895
• Merge (a4089c2): https://github.com/firebase/firebase-js-sdk/actions/runs/11077205242

1. https://storage.googleapis.com/firebase-sdk-metric-reports/itG7HcZY6l.html